CN115126599B - Variable compression ratio engine system, vehicle and control method thereof - Google Patents
Variable compression ratio engine system, vehicle and control method thereof Download PDFInfo
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- CN115126599B CN115126599B CN202210681728.XA CN202210681728A CN115126599B CN 115126599 B CN115126599 B CN 115126599B CN 202210681728 A CN202210681728 A CN 202210681728A CN 115126599 B CN115126599 B CN 115126599B
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- 230000006835 compression Effects 0.000 title claims abstract description 35
- 238000007906 compression Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 79
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 14
- 230000004323 axial length Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 144
- 239000000446 fuel Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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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
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/044—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of an adjustable piston length
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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
- F02D15/04—Varying compression ratio by alteration of volume of compression space without changing piston stroke
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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
- F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
- F02D2700/03—Controlling by changing the compression ratio
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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)
Abstract
A variable compression ratio engine system, a vehicle, and a control method thereof are provided. The engine system comprises a cylinder body, a crankshaft, a piston device and a pressure oil supply device, wherein the crankshaft is rotatably arranged on the cylinder body, the piston device comprises a first piston and a hydraulic telescopic mechanism, the first piston is movably arranged on the cylinder body, one end of the hydraulic telescopic mechanism is in transmission connection with the first piston, the other end of the hydraulic telescopic mechanism is in transmission connection with the crankshaft, and the pressure oil supply device is communicated with the hydraulic telescopic mechanism and is used for adjusting the telescopic state of the hydraulic telescopic mechanism. Compared with the connecting rod mechanism in the related art, the hydraulic telescopic mechanism is simpler, so that the engine system is simpler in structure, lower in production cost and lower in assembly consistency requirement.
Description
Technical Field
The present disclosure relates to vehicle technology, and more particularly, to a variable compression ratio engine system, a vehicle, and a method of controlling the same.
Background
With the increasing technology level, the life of energy conservation, emission reduction, low carbon and environmental protection has become a common theme around the world. As a "heart" of an automobile, a small-displacement, high-power, high-thermal-efficiency, lightweight, low-emission engine has become a main development direction of the engine. In order to meet the requirements, on the basis of an otto cycle engine, miller cycle and Atkinson cycle engines adopting the technologies of air intake supercharging (Turbo), continuous Variable Valve Timing (CVVT), continuous Variable Valve Lift (CVVL) and the like are widely upgraded and applied.
The related art provides an Atkinson cycle engine, and the engine is based on an Otto cycle engine, and a set of complex connecting rod mechanism is arranged to change the compression ratio of the engine, so that different compression ratio control is performed according to different working condition demands, and the effects of improving fuel economy and engine thermal efficiency and improving engine emission can be achieved. However, the engine has a complex structure, high production cost and high assembly consistency requirement.
Disclosure of Invention
In order to solve at least one of the technical problems, the application provides a variable compression ratio engine system, which changes the compression ratio of the engine system, controls different compression ratios according to different working condition demands, and can achieve the effects of improving fuel economy and heat efficiency of the engine system and improving emission of the engine system; the engine system is simpler in structure, lower in production cost and lower in assembly consistency requirement.
The application also provides a vehicle and a control method of the vehicle.
The engine system with the variable compression ratio comprises a cylinder body, a crankshaft, a piston device and a pressure oil supply device, wherein the crankshaft is rotatably arranged on the cylinder body, the piston device comprises a first piston and a hydraulic telescopic mechanism, the first piston is movably arranged on the cylinder body, one end of the hydraulic telescopic mechanism is in transmission connection with the first piston, the other end of the hydraulic telescopic mechanism is in transmission connection with the crankshaft, and the pressure oil supply device is communicated with the hydraulic telescopic mechanism and is used for adjusting the telescopic state of the hydraulic telescopic mechanism.
In an exemplary embodiment, the hydraulic telescoping mechanism includes: a cylinder; the second piston is axially movably arranged on the cylinder barrel and surrounds the cylinder barrel to form a hydraulic cavity with adjustable axial length, and the pressure oil supply device is communicated with the hydraulic cavity; the return spring is positioned in the hydraulic cavity and is pulled and held between the cylinder barrel and the second piston; one of the second piston and the cylinder is in transmission connection with the first piston, and the other is in transmission connection with the crankshaft.
In an exemplary embodiment, the cylinder includes: a cylinder; the second piston and the third piston are axially spaced in the cylinder and are both axially movably arranged on the cylinder; the second piston, the third piston and the cylinder body encircle to form the hydraulic cavity, the return spring is pulled and held between the second piston and the third piston, one of the second piston and the third piston is in transmission connection with the first piston through a first connecting rod, and the other of the second piston and the third piston is in transmission connection with the crankshaft through a second connecting rod.
In an exemplary embodiment, the pressure oil supply device includes: a supply pump for supplying pressure oil; the control valve is used for adjusting the pressure of pressure oil in a passage between the control valve and the hydraulic cavity so as to adjust the telescopic state of the hydraulic telescopic mechanism; and a pressure detection device provided in a passage between the control valve and the hydraulic chamber, for detecting pressure information of the pressure oil in the passage between the control valve and the hydraulic chamber.
In an exemplary embodiment, the control valve has an oil inlet in communication with the feed pump, an oil outlet in communication with the hydraulic chamber, and an oil discharge port; the control valve is arranged to adjust the pressure of the pressure oil in the passage between the oil outlet and the hydraulic chamber by adjusting the opening of the oil discharge port; the pressure detection device is used for detecting pressure information of pressure oil in a passage between the oil outlet and the hydraulic cavity.
In an exemplary embodiment, the engine system further comprises: the control device is electrically connected with the pressure detection device and the control valve, and is used for adjusting the opening of the oil discharge port of the control valve according to the load born by the system, a preset comparison table and the pressure information so as to adjust the pressure of the pressure oil in the passage between the oil outlet and the hydraulic cavity.
In an exemplary embodiment, the cylinder body is provided with a first oil path, the crankshaft is provided with a second oil path, the hydraulic telescopic mechanism is provided with a third oil path, the control valve, the first oil path, the second oil path, the third oil path and the hydraulic cavity are sequentially communicated, and the pressure detection device is connected to the first oil path.
In an exemplary embodiment, the pressure information is actual pressure data; the control device is configured to:
acquiring preset pressure data corresponding to the load born by the system according to the load born by the system and the preset comparison table;
comparing the actual pressure data with the preset pressure data, and adjusting the opening of the oil discharge port of the control valve according to the comparison result to adjust the pressure of the pressure oil in the passage between the oil outlet and the hydraulic cavity to the preset pressure data.
The vehicle provided by the embodiment of the invention comprises the engine system according to any one of the embodiments.
The control method of the vehicle provided by the embodiment of the invention comprises the following steps:
acquiring pressure information of pressure oil in a passage between the pressure oil supply device and the hydraulic telescopic mechanism;
and adjusting the pressure oil supply device according to the load born by the system, a preset comparison table and the pressure information, so as to adjust the telescopic state of the hydraulic telescopic mechanism.
In an exemplary embodiment, the step of acquiring pressure information of the pressure oil in the passage between the pressure oil supply device and the hydraulic telescopic mechanism includes:
and acquiring pressure information of pressure oil in a passage between the oil outlet and the hydraulic cavity.
In an exemplary embodiment, the adjusting the pressure oil supply device according to the load applied to the system, a preset map, and the pressure information includes:
acquiring preset pressure data corresponding to the load born by the system according to the load born by the system and the preset comparison table;
comparing the actual pressure data with the preset pressure data, and adjusting the opening of the oil discharge port of the control valve according to the comparison result to adjust the pressure of the pressure oil in the passage between the oil outlet and the hydraulic cavity to the preset pressure data.
According to the variable compression ratio engine system, the piston device comprises the first piston and the hydraulic telescopic mechanism, the first piston is movably arranged in the cylinder body, one end of the hydraulic telescopic mechanism is in transmission connection with the first piston, the other end of the hydraulic telescopic mechanism is in transmission connection with the crankshaft, the pressure oil supply device is communicated with the hydraulic telescopic mechanism, the length of the piston device can be changed by adjusting the telescopic state of the hydraulic telescopic mechanism, the compression ratio of the engine system is changed, different compression ratio control is performed according to different working condition requirements, and the effects of improving fuel economy and heat efficiency of the engine system and improving emission of the engine system can be achieved; moreover, compared with the connecting rod mechanism in the related art, the hydraulic telescopic mechanism is simpler, so that the engine system is simpler in structure, lower in production cost and lower in assembly consistency requirement.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. Other advantages of the present application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The accompanying drawings are included to provide an understanding of the technical aspects of the present application, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present application and together with the examples of the present application, and not constitute a limitation of the technical aspects of the present application.
FIG. 1 is a schematic diagram of a variable compression ratio engine system according to an embodiment of the present disclosure;
FIG. 2 is a schematic cross-sectional view of the hydraulic telescoping mechanism of FIG. 1;
FIG. 3 is a flow chart of a method of controlling a vehicle according to an embodiment of the invention;
fig. 4 is a flowchart of a control method of a vehicle according to another embodiment of the invention.
The correspondence between the reference numerals and the component names in fig. 1 and 2 is:
110 first oil path, 200 crank shaft, 210 second oil path, 300 piston device, 310 first piston, 320 hydraulic telescopic mechanism, 321 third oil path, 330 second piston, 340 third piston, 350 cylinder, 360 hydraulic cavity, 370 return spring, 380 first connecting rod, 390 second connecting rod, 400 pressure oil supply device, 410 control valve, 420 pressure detection device.
Detailed Description
The present application describes several embodiments, but the description is illustrative and not restrictive, and for the purposes, technical solutions and advantages of the present invention to be more apparent, the embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.
As shown in fig. 1 and 2, the engine system with variable compression ratio provided by the embodiment of the invention comprises a cylinder body, a crankshaft 200, a piston device 300 and a pressure oil supply device 400, wherein the crankshaft 200 is rotatably installed on the cylinder body, the piston device 300 comprises a first piston 310 and a hydraulic telescopic mechanism 320, the first piston 310 is movably installed on the cylinder body, one end of the hydraulic telescopic mechanism 320 is in transmission connection with the first piston 310, the other end of the hydraulic telescopic mechanism is in transmission connection with the crankshaft 200, and the pressure oil supply device 400 is communicated with the hydraulic telescopic mechanism 320 and is used for adjusting the telescopic state of the hydraulic telescopic mechanism 320. The telescoping state includes lengthening, shortening, and maintaining the length unchanged.
In the engine system with the variable compression ratio, a piston device 300 comprises a first piston 310 and a hydraulic telescopic mechanism 320, wherein the first piston 310 is movably arranged in a cylinder body, one end of the hydraulic telescopic mechanism 320 is in transmission connection with the first piston 310, the other end of the hydraulic telescopic mechanism is in transmission connection with a crankshaft 200, a pressure oil supply device 400 is communicated with the hydraulic telescopic mechanism 320, the length of the piston device 300 can be changed by adjusting the telescopic state of the hydraulic telescopic mechanism 320, the compression ratio of the engine system is changed, different compression ratio control is performed according to different working condition requirements, the effects of improving the fuel economy and the thermal efficiency of the engine system and improving the emission of the engine system can be achieved; moreover, the hydraulic telescopic mechanism 320 is simpler than the link mechanism in the related art, so that the engine system is simpler in structure, lower in production cost and lower in assembly consistency requirement.
In an exemplary embodiment, hydraulic telescoping mechanism 320 includes: a cylinder; a second piston 330 axially (axially of the cylinder) movably mounted to the cylinder and surrounding the cylinder with a hydraulic chamber 360 of adjustable axial length, the hydraulic chamber 360 being in communication with the pressure oil supply device 400; and a return spring 370 located in the hydraulic chamber 360 and pulled between the cylinder tube and the second piston 330 (see fig. 2 for understanding); one of the second piston 330 and the cylinder is in driving connection (e.g., hinged connection) with the first piston 310, and the other is in driving connection (e.g., hinged connection) with the crankshaft 200.
The pressure of the pressure oil acting on the second piston 330 is greater than the elastic force of the return spring 370 (i.e., the tension of the return spring 370 to the second piston 330), the pressure oil quantity in the hydraulic chamber 360 is increased under the action of the pressure oil acting on the second piston 330, the axial length of the hydraulic chamber 360 is increased, the hydraulic telescopic mechanism 320 is extended, the length of the return spring 370 is increased, and the fuel economy can be improved by increasing the stroke of the piston device 300 and increasing the compression ratio of the engine system, so that the hydraulic telescopic mechanism is suitable for a small-load working condition. The pressure of the pressure oil acting on the second piston 330 is smaller than the elasticity of the return spring 370, the amount of pressure oil in the hydraulic cavity 360 is reduced under the action of the elasticity of the return spring 370, the axial length of the hydraulic cavity 360 is reduced, the hydraulic telescopic mechanism 320 is shortened, the length of the return spring 370 is reduced, the engine dynamic property can be improved by reducing the stroke of the piston device 300 and the compression ratio of an engine system, and the hydraulic telescopic mechanism is suitable for a heavy load working condition. The pressure of the pressure oil acting on the second piston 330 is equal to the elastic force of the return spring 370, the amount of the pressure oil in the hydraulic chamber 360 is unchanged, the axial length of the hydraulic chamber 360 is unchanged, and the length of the hydraulic telescopic mechanism 320 is kept unchanged.
The cylinder barrel can be of an integrated structure; alternatively, as shown in fig. 2, the cylinder may be of a split type structure, for example, the cylinder includes a cylinder 350 and a third piston 340, where the second piston 330 and the third piston 340 are spaced apart in the axial direction of the cylinder 350 and are both axially movably mounted in the cylinder 350 (of course, one of the second piston 330 and the third piston 340 may be fixedly mounted in the cylinder 350 and the other is axially movably mounted in the cylinder 350); wherein the second piston 330, the third piston 340 and the cylinder 350 enclose a hydraulic chamber 360, the return spring 370 is pulled between the second piston 330 and the third piston 340, one of the second piston 330 and the third piston 340 is in transmission connection with the first piston 310 through a first connecting rod 380, and the other is in transmission connection with the crankshaft 200 through a second connecting rod 390; the foregoing may all achieve the purpose of the present application, and the spirit of the present application is not departing from the design concept of the present invention, and the disclosure is not repeated herein, and all the purpose should be within the protection scope of the present application.
In an exemplary embodiment, as shown in fig. 1 and 2, the pressure oil supply apparatus 400 includes: an oil feed pump (not shown) for feeding pressure oil; a control valve 410, the oil feed pump is communicated with the hydraulic chamber 360 through the control valve 410, the control valve 410 is used for adjusting the pressure of the pressure oil in the passage between the control valve 410 and the hydraulic chamber 360, so as to adjust the telescopic state of the hydraulic telescopic mechanism 320; and a pressure detection device 420 provided in a passage between the control valve 410 and the hydraulic chamber 360 for detecting pressure information of the pressure oil in the passage between the control valve 410 and the hydraulic chamber 360. The pressure detection device 420 detects pressure information of the pressure oil in the passage between the control valve 410 and the hydraulic chamber 360; the ECU adjusts the pressure of the pressure oil output by the control valve 410 according to the load born by the system, a preset reference table and pressure information, so that the pressure of the pressure oil in the passage between the control valve 410 and the hydraulic chamber 360 is changed, thereby adjusting the telescopic state of the hydraulic telescopic mechanism 320, and achieving the purpose of changing the length of the piston device 300 and changing the compression ratio of the engine system. According to different working condition demands, different compression ratios are controlled, so that the effects of improving fuel economy and heat efficiency of an engine system and improving emission of the engine system can be achieved. The control device can also be set to control the fuel injection quantity and the ignition advance angle of the engine system according to different working conditions and a preset data table so as to further improve the performance of the engine system, and the aim of the application can be fulfilled.
The pressure detecting device 420 is a pressure sensor, the oil supply pump is an oil pump, the control valve 410 may be an oil control valve or an electromagnetic directional valve (such as a three-position four-way electromagnetic directional valve), and for the type of the control valve 410, those skilled in the art can reasonably select according to actual needs, which is not limited herein.
In one embodiment, as shown in FIG. 1, the control valve 410 has an oil inlet, an oil outlet, and an oil discharge port, the oil inlet is in communication with the feed pump, the oil outlet is in communication with the hydraulic chamber 360, and the oil discharge port is in communication with the sump; the control valve 410 is provided to adjust the pressure of the pressure oil in the passage between the oil outlet and the hydraulic chamber 360 by adjusting the opening degree of the oil discharge port; the pressure detection device 420 is used to detect pressure information of the pressure oil in the passage between the oil outlet and the hydraulic chamber 360. Namely: the pressure detecting means detects pressure information of the pressure oil in the passage between the oil outlet and the hydraulic chamber 360; the ECU adjusts the opening of the oil discharge port of the control valve 410 according to the load born by the system, a preset reference table and pressure information, so that the pressure of the pressure oil in the passage between the oil discharge port and the hydraulic chamber 360 is changed, thereby adjusting the telescopic state of the hydraulic telescopic mechanism 320, and achieving the purpose of changing the length of the piston device 300 and changing the compression ratio of the engine system.
In an exemplary embodiment, the engine system further comprises: the control device (not shown in the figure), the pressure detection device 420 and the control valve 410 are electrically connected with the control device, and the control device is configured to adjust the opening of the oil discharge port of the control valve 410 according to the load born by the system, a preset reference table and pressure information, so as to adjust the pressure of the pressure oil in the passage between the oil outlet port and the hydraulic chamber 360. The control device is provided as an ECU (Electronic Control Unit ).
Pressure detection device 420 detects pressure information of pressure oil in a passage between the oil outlet and hydraulic chamber 360; the control device adjusts the opening of the oil discharge port of the control valve 410 according to the load born by the system, a preset comparison table and pressure information, so that the pressure of the pressure oil in the passage between the oil discharge port and the hydraulic cavity 360 is changed, and the telescopic state of the hydraulic telescopic mechanism 320 is adjusted, thereby achieving the purpose of changing the length of the piston device 300 and changing the compression ratio of the engine system. According to different working condition demands, different compression ratios are controlled, so that the effects of improving fuel economy and heat efficiency of an engine system and improving emission of the engine system can be achieved.
In one example, the pressure information is actual pressure data; as shown in fig. 4, the control device is configured to:
acquiring preset pressure data corresponding to the load born by the system according to a preset comparison table according to the load born by the system;
the actual pressure data and the preset pressure data are compared, and the opening of the oil discharge port of the control valve 410 is adjusted according to the comparison result, so that the pressure of the pressure oil in the passage between the oil outlet and the hydraulic chamber 360 is adjusted to the preset pressure data (the final actual pressure data is equal to the preset pressure data).
Such as: the actual pressure data is greater than the preset pressure data, increasing the opening of the oil discharge port of the control valve 410; the actual pressure data is smaller than the preset pressure data, and the opening of the oil discharge port of the control valve 410 is reduced; the actual pressure data is equal to the preset pressure data, and the opening degree of the oil discharge port of the control valve 410 is kept unchanged.
The load borne by the system comprises a small load working condition and a large load working condition.
Small load condition: under the control of the control device, the control valve 410 supplies oil to the hydraulic chamber 360, the pressure of the pressure oil acting on the second piston 330 is larger than the elastic force of the return spring 370, the amount of the pressure oil in the hydraulic chamber 360 is increased, the axial length of the hydraulic chamber 360 is increased, the hydraulic telescopic mechanism 320 is extended, the length of the return spring 370 is increased, and the fuel economy can be improved by increasing the stroke of the piston device 300 and increasing the compression ratio of the engine system.
Heavy load conditions: under the control of the control device, the control valve 410 discharges oil from the hydraulic chamber 360, the pressure of the pressure oil acting on the second piston 330 is smaller than the elastic force of the return spring 370, the pressure oil amount in the hydraulic chamber 360 is reduced (the oil discharge port of the hydraulic chamber 360 discharges oil) under the action of the elastic force of the return spring 370, the axial length of the hydraulic chamber 360 is reduced, the hydraulic telescopic mechanism 320 is shortened, the length of the return spring 370 is reduced, and the engine dynamic property can be improved by reducing the stroke of the piston device 300 and the compression ratio of an engine system.
In an embodiment, as shown in fig. 1 and 2, the cylinder is provided with a first oil path 110, the crankshaft 200 is provided with a second oil path 210, the hydraulic telescoping mechanism 320 is provided with a third oil path 321, the control valve 410, the first oil path, the second oil path, the third oil path and the hydraulic chamber 360 are sequentially communicated, and the pressure detection device 420 is connected to the first oil path 110. The first oil passage 110 and the second oil passage 210 are communicated with each other through a dynamic seal structure, and the second oil passage 210 and the third oil passage 321 are also communicated with each other through a dynamic seal structure.
In one embodiment, the piston device 300 is a plurality; it is possible that one oil control valve 410 controls a plurality of piston devices 300; alternatively, the plurality of oil control valves 410 (e.g., one-to-one correspondence) may control the plurality of piston devices 300, etc.; the foregoing may all achieve the purpose of the present application, and the spirit of the present application is not departing from the design concept of the present invention, and the disclosure is not repeated herein, and all the purpose should be within the protection scope of the present application.
A vehicle (not shown in the drawings) provided by an embodiment of the present invention includes the engine system according to any one of the above embodiments.
The vehicle has all the advantages of the engine system provided in any of the above embodiments, and will not be described in detail herein.
The method for controlling the vehicle provided by the embodiment of the invention, as shown in fig. 3, comprises the following steps:
acquiring pressure information of the pressure oil in the passage between the pressure oil supply device 400 and the hydraulic telescopic mechanism 320;
the hydraulic oil supply device 400 is adjusted according to the load applied by the system, a preset reference table and pressure information, so as to adjust the telescopic state of the hydraulic telescopic mechanism 320.
The load borne by the system comprises a small load working condition and a large load working condition.
Small load condition: under control of the control device, the pressure oil supply device 400 supplies oil to the hydraulic telescopic mechanism 320, the hydraulic telescopic mechanism 320 is extended, and fuel economy can be improved by increasing the stroke of the piston device 300 and increasing the compression ratio of the engine system.
Heavy load conditions: under the control of the control device, the pressure oil supply device 400 discharges oil to the hydraulic telescopic mechanism 320, the hydraulic telescopic mechanism 320 is shortened, and the engine dynamic property can be improved by reducing the stroke of the piston device 300 and the compression ratio of the engine system.
The control device can also be set to control the fuel injection quantity and the ignition advance angle according to different working conditions and a preset data table so as to further improve the performance of the engine system, and the aim of the application can be fulfilled.
In an example, as shown in fig. 4, the step of acquiring pressure information of the pressure oil in the passage between the pressure oil supply device 400 and the hydraulic telescoping mechanism 320 includes: pressure information of the pressure oil in the passage between the oil outlet and the hydraulic chamber 360 is acquired. The step of adjusting the pressure oil supply device 400 according to the load applied to the system, the preset map and the pressure information includes: acquiring preset pressure data corresponding to the load born by the system according to a preset comparison table according to the load born by the system; the actual pressure data and the preset pressure data are compared, and the opening of the oil discharge port of the control valve 410 is adjusted according to the comparison result, so that the pressure of the pressure oil in the passage between the oil outlet and the hydraulic chamber 360 is adjusted to the preset pressure data. Such as: the actual pressure data is greater than the preset pressure data, increasing the opening of the oil discharge port of the control valve 410; the actual pressure data is smaller than the preset pressure data, and the opening of the oil discharge port of the control valve 410 is reduced; the actual pressure data is equal to the preset pressure data, and the opening degree of the oil discharge port of the control valve 410 is kept unchanged.
Small load condition: under the control of the control device, the control valve 410 supplies oil to the hydraulic chamber 360, the pressure of the pressure oil acting on the second piston 330 is greater than the elastic force of the return spring 370, the amount of the pressure oil in the hydraulic chamber 360 is increased, the axial length of the hydraulic chamber 360 is increased, the hydraulic telescopic mechanism 320 is extended, and the fuel economy can be improved by increasing the stroke of the piston device 300 and increasing the compression ratio of the engine system.
Heavy load conditions: under the control of the control device, the control valve 410 discharges oil from the hydraulic chamber 360, the pressure of the pressure oil acting on the second piston 330 is smaller than the elastic force of the return spring 370, the pressure oil quantity in the hydraulic chamber 360 is reduced (the oil discharge port of the hydraulic chamber 360 discharges oil) under the action of the elastic force of the return spring 370, the axial length of the hydraulic chamber 360 is reduced, the hydraulic telescopic mechanism 320 is shortened, and the engine dynamic property can be improved by reducing the stroke of the piston device 300 and the compression ratio of an engine system.
In summary, in the engine system with variable compression ratio provided by the application, the piston device comprises the first piston and the hydraulic telescopic mechanism, the first piston is movably installed in the cylinder body, one end of the hydraulic telescopic mechanism is in transmission connection with the first piston, the other end of the hydraulic telescopic mechanism is in transmission connection with the crankshaft, the pressure oil supply device is communicated with the hydraulic telescopic mechanism, the length of the piston device can be changed by adjusting the telescopic state of the hydraulic telescopic mechanism, the compression ratio of the engine system is changed, different compression ratio control is performed according to different working condition requirements, the effects of improving fuel economy and thermal efficiency of the engine system and improving emission of the engine system can be achieved; moreover, compared with the connecting rod mechanism in the related art, the hydraulic telescopic mechanism is simpler, so that the engine system is simpler in structure, lower in production cost and lower in assembly consistency requirement.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms "upper", "lower", "one side", "the other side", "one end", "the other end", "the side", "the opposite", "four corners", "the periphery", "the" mouth "character structure", etc., are directions or positional relationships based on the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structures referred to have a specific direction, are configured and operated in a specific direction, and thus are not to be construed as limiting the present invention.
In the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," "assembled" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, and may also be in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is defined by the appended claims.
Claims (8)
1. The engine system with the variable compression ratio is characterized by comprising a cylinder body, a crankshaft, a piston device and a pressure oil supply device, wherein the crankshaft is rotatably installed on the cylinder body, the piston device comprises a first piston and a hydraulic telescopic mechanism, the first piston is movably installed on the cylinder body, one end of the hydraulic telescopic mechanism is in transmission connection with the first piston, the other end of the hydraulic telescopic mechanism is in transmission connection with the crankshaft, and the pressure oil supply device is communicated with the hydraulic telescopic mechanism and is used for adjusting the telescopic state of the hydraulic telescopic mechanism; the hydraulic telescoping mechanism comprises:
a cylinder;
the second piston is axially movably arranged on the cylinder barrel and surrounds the cylinder barrel to form a hydraulic cavity with adjustable axial length, and the pressure oil supply device is communicated with the hydraulic cavity; and
a return spring positioned in the hydraulic chamber and pulled between the cylinder and the second piston; the cylinder includes:
a cylinder; and
the second piston and the third piston are axially spaced in the cylinder body and are axially movably arranged on the cylinder body;
the second piston, the third piston and the cylinder body encircle to form the hydraulic cavity, the return spring is pulled and held between the second piston and the third piston, one of the second piston and the third piston is in transmission connection with the first piston through a first connecting rod, and the other of the second piston and the third piston is in transmission connection with the crankshaft through a second connecting rod.
2. The engine system of claim 1, wherein the pressure oil supply device comprises:
a supply pump for supplying pressure oil;
the control valve is used for adjusting the pressure of pressure oil in a passage between the control valve and the hydraulic cavity so as to adjust the telescopic state of the hydraulic telescopic mechanism; and
and the pressure detection device is arranged on the passage between the control valve and the hydraulic cavity and is used for detecting pressure information of pressure oil in the passage between the control valve and the hydraulic cavity.
3. The engine system of claim 2, wherein the control valve has an oil inlet in communication with the feed pump, an oil outlet in communication with the hydraulic chamber, and an oil discharge port; the control valve is arranged to adjust the pressure of the pressure oil in the passage between the oil outlet and the hydraulic chamber by adjusting the opening of the oil discharge port; the pressure detection device is used for detecting pressure information of pressure oil in a passage between the oil outlet and the hydraulic cavity.
4. The engine system of claim 3, further comprising:
the control device is electrically connected with the pressure detection device and the control valve, and is used for adjusting the opening of the oil discharge port of the control valve according to the load born by the system, a preset comparison table and the pressure information so as to adjust the pressure of the pressure oil in the passage between the oil outlet and the hydraulic cavity.
5. The engine system of claim 4, wherein the pressure information is actual pressure data; the control device is configured to:
acquiring preset pressure data corresponding to the load born by the system according to the load born by the system and the preset comparison table;
comparing the actual pressure data with the preset pressure data, and adjusting the opening of the oil discharge port of the control valve according to the comparison result to adjust the pressure of the pressure oil in the passage between the oil outlet and the hydraulic cavity to the preset pressure data.
6. A vehicle comprising an engine system according to any one of claims 1 to 5.
7. A control method of the vehicle according to claim 6, characterized by comprising:
acquiring pressure information of pressure oil in a passage between the pressure oil supply device and the hydraulic telescopic mechanism;
and adjusting the pressure oil supply device according to the load born by the system, a preset comparison table and the pressure information, so as to adjust the telescopic state of the hydraulic telescopic mechanism.
8. The control method according to claim 7, characterized in that the engine system is the engine system according to claim 5; the step of acquiring pressure information of the pressure oil in the passage between the pressure oil supply device and the hydraulic telescoping mechanism includes:
acquiring pressure information of pressure oil in a passage between the oil outlet and the hydraulic cavity; the step of adjusting the pressure oil supply device according to the load born by the system, a preset comparison table and the pressure information comprises the following steps:
acquiring preset pressure data corresponding to the load born by the system according to the load born by the system and the preset comparison table;
comparing the actual pressure data with the preset pressure data, and adjusting the opening of the oil discharge port of the control valve according to the comparison result to adjust the pressure of the pressure oil in the passage between the oil outlet and the hydraulic cavity to the preset pressure data.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109321A (en) * | 2007-08-08 | 2008-01-23 | 陈晨 | Self-adaption compression ratio variable engine |
| JP2012229643A (en) * | 2011-04-26 | 2012-11-22 | Nissan Motor Co Ltd | Variable compression ratio device for internal combustion engine |
| KR101382315B1 (en) * | 2012-12-17 | 2014-04-08 | 현대자동차 주식회사 | Variable compression ratio device |
| CN106089977A (en) * | 2016-06-08 | 2016-11-09 | 北汽福田汽车股份有限公司 | Engine link mechanism, variable compression ratio of engines system, electromotor and vehicle |
| CN106224093A (en) * | 2016-07-28 | 2016-12-14 | 中北大学 | A kind of hydraulic speed control formula variable compression ratio engine |
| CN106968788A (en) * | 2017-05-22 | 2017-07-21 | 吉林大学 | A kind of variable compression ratio of engines device |
| CN107842422A (en) * | 2017-10-10 | 2018-03-27 | 中国第汽车股份有限公司 | A kind of fluid power controls formula compression ratio mechanism |
| CN107859687A (en) * | 2017-10-10 | 2018-03-30 | 中国第汽车股份有限公司 | A kind of variable length link with hydraulic mechanism |
| CN209483479U (en) * | 2018-12-25 | 2019-10-11 | 比亚迪股份有限公司 | Engine link telescopic component, engine and vehicle |
| CN210264916U (en) * | 2019-07-01 | 2020-04-07 | 贵州大学 | Cylinder piston structure with variable compression ratio of engine |
| CN213017247U (en) * | 2020-07-28 | 2021-04-20 | 比亚迪股份有限公司 | Engine connecting rod and engine with same |
| CN214118346U (en) * | 2020-07-28 | 2021-09-03 | 比亚迪股份有限公司 | Piston device for engine and engine |
-
2022
- 2022-06-15 CN CN202210681728.XA patent/CN115126599B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109321A (en) * | 2007-08-08 | 2008-01-23 | 陈晨 | Self-adaption compression ratio variable engine |
| JP2012229643A (en) * | 2011-04-26 | 2012-11-22 | Nissan Motor Co Ltd | Variable compression ratio device for internal combustion engine |
| KR101382315B1 (en) * | 2012-12-17 | 2014-04-08 | 현대자동차 주식회사 | Variable compression ratio device |
| CN106089977A (en) * | 2016-06-08 | 2016-11-09 | 北汽福田汽车股份有限公司 | Engine link mechanism, variable compression ratio of engines system, electromotor and vehicle |
| CN106224093A (en) * | 2016-07-28 | 2016-12-14 | 中北大学 | A kind of hydraulic speed control formula variable compression ratio engine |
| CN106968788A (en) * | 2017-05-22 | 2017-07-21 | 吉林大学 | A kind of variable compression ratio of engines device |
| CN107842422A (en) * | 2017-10-10 | 2018-03-27 | 中国第汽车股份有限公司 | A kind of fluid power controls formula compression ratio mechanism |
| CN107859687A (en) * | 2017-10-10 | 2018-03-30 | 中国第汽车股份有限公司 | A kind of variable length link with hydraulic mechanism |
| CN209483479U (en) * | 2018-12-25 | 2019-10-11 | 比亚迪股份有限公司 | Engine link telescopic component, engine and vehicle |
| CN210264916U (en) * | 2019-07-01 | 2020-04-07 | 贵州大学 | Cylinder piston structure with variable compression ratio of engine |
| CN213017247U (en) * | 2020-07-28 | 2021-04-20 | 比亚迪股份有限公司 | Engine connecting rod and engine with same |
| CN214118346U (en) * | 2020-07-28 | 2021-09-03 | 比亚迪股份有限公司 | Piston device for engine and engine |
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|---|---|
| CN115126599A (en) | 2022-09-30 |
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