CN111828120A - Transmission structure, system, camshaft torque adjusting method and engine - Google Patents
Transmission structure, system, camshaft torque adjusting method and engine Download PDFInfo
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- CN111828120A CN111828120A CN202010507028.XA CN202010507028A CN111828120A CN 111828120 A CN111828120 A CN 111828120A CN 202010507028 A CN202010507028 A CN 202010507028A CN 111828120 A CN111828120 A CN 111828120A
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- camshaft
- torque
- worm
- motor
- timing belt
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/348—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear by means acting on timing belts or chains
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0276—Actuation of an additional valve for a special application, e.g. for decompression, exhaust gas recirculation or cylinder scavenging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L2013/10—Auxiliary actuators for variable valve timing
- F01L2013/103—Electric motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/09—Calibrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The application provides a transmission structure, a system, a camshaft torque adjusting method and an engine, wherein the transmission structure comprises a camshaft belt pulley, a camshaft, a motor, a worm and gear structure and a torque sensor; the motor can drive the worm and gear structure; the worm gear structure comprises a worm gear; the worm wheel and the camshaft belt pulley are sleeved on the camshaft and connected with the camshaft belt pulley; the worm wheel can drive the camshaft to rotate, and the camshaft can drive the camshaft belt pulley to rotate; the torque sensor is arranged in the camshaft and can acquire the torque of the camshaft. The timing belt transmission structure provided by the embodiment of the application determines the real-time torque of the camshaft through the torque sensor, provides the camshaft correction torque by using the motor, changes the fluctuating camshaft torque into the stable torque related to the rotating speed, and enables the timing belt to be in a lower tension level in the working period.
Description
Technical Field
The application relates to the technical field of engines, in particular to a transmission structure, a transmission system, a camshaft torque adjusting method and an engine.
Background
The engine is powered by combustion within the cylinders, converting the chemical energy of the fuel into mechanical energy. The timing of the intake of air or fuel into the cylinder, and the exhaust of combusted exhaust gas, is controlled by the valve train. The timing belt transmission system is used for transmitting the rotation of the crankshaft to a camshaft in the air distribution mechanism so as to further control the opening and closing of the air valve. The air inlet valve and the air outlet valve are always connected with a spring, and after the air inlet valve and the air outlet valve are opened by overcoming the spring force, a reverse torque is generated by the air inlet valve and the air outlet valve and is acted on a camshaft. The torque of the camshaft fluctuates as the camshaft selectively opens and closes the intake or exhaust valve. On the other hand, when the valve is closed, the valve torque coincides with the rotational direction of the camshaft and acts on the camshaft, and these torques cause the torque of the camshaft to fluctuate. As a driven part of a timing belt transmission system, if the torque of a camshaft fluctuates, the driving force of a timing belt can be changed, namely, the tension of each section of the timing belt transmission system fluctuates, so that the problems of overlarge belt tension, overlarge timing error and the like are caused, the oil consumption and the emission of an engine are influenced, the service life of the timing belt is shortened, and even the timing belt is broken.
In some prior art schemes, a non-circular driving component introduces an extra torque in operation through a non-circular wheel design, and offsets the change of camshaft torque through the torque so as to achieve the purpose of reducing the tension of a timing belt.
The non-circular wheel scheme can improve the dynamic performance of a timing system and reduce the dynamic tension of a timing belt for the design of non-circular quantity and non-circular degree, but cannot give consideration to different rotating speeds and load working conditions, and the average tension of the timing belt is still at a larger level.
Disclosure of Invention
The application is solved to be that prior art camshaft moment of torsion produces undulant easily, leads to the too big technical problem of belt tension.
In order to solve the technical problem, a first aspect of the embodiments of the present application discloses a timing belt transmission structure, which includes a camshaft belt pulley, a camshaft, a motor, a worm and gear structure, and a torque sensor;
the motor can drive the worm and gear structure;
the worm gear structure comprises a worm gear;
the worm wheel and the camshaft belt pulley are sleeved on the camshaft and connected with the camshaft belt pulley; the worm wheel can drive the camshaft to rotate, and the camshaft can drive the camshaft belt pulley to rotate;
the torque sensor is arranged in the camshaft and can acquire the torque of the camshaft.
Further, the timing belt transmission structure also comprises a one-way bearing; the worm wheel is connected with the camshaft belt pulley through a one-way bearing.
Optionally, the timing belt transmission structure further comprises a transmission pair, and the worm wheel is connected with the camshaft belt pulley through the transmission pair.
Further, the worm and gear structure also comprises a worm, the motor is connected with the worm, and the worm is connected with the worm wheel in a matching way.
A second aspect of an embodiment of the present application provides a timing belt transmission system, which is a closed-loop control system; the timing belt transmission system comprises a control module and a timing belt transmission structure;
the torque sensor is connected with the control module; the control module is connected with the motor;
the torque sensor can transmit real-time torque of the camshaft to the control module;
the control module can output a compensation torque value required to be provided by the motor according to the real-time torque of the camshaft and the camshaft calibration torque arranged in the control module;
the motor can perform torque correction on the camshaft according to the compensation torque value.
Further, the motor is capable of torque-correcting the camshaft according to the compensation torque value, and includes:
the motor drives the worm wheel to rotate according to the compensation torque value, and the worm wheel drives the camshaft to rotate so as to carry out torque correction on the camshaft.
A third aspect of the embodiments of the present application provides a method for adjusting a torque of a camshaft, including the steps of:
the method comprises the steps that a torque sensor in a camshaft is used for obtaining real-time torque of the camshaft, and the real-time torque of the camshaft is sent to a control module through the torque sensor;
the control module outputs a compensation torque value required to be provided by the motor according to the real-time torque of the camshaft and the camshaft calibration torque arranged in the control module;
and controlling the motor to adjust the torque of the camshaft according to the compensation torque value.
Further, controlling the motor to adjust the camshaft torque according to the compensation torque value comprises:
and the control motor drives the worm wheel to rotate according to the compensation torque value, and the worm wheel drives the camshaft to rotate so as to adjust the torque of the camshaft.
A fourth aspect of embodiments of the present application provides an engine including a timing belt drive structure.
A fifth aspect of an embodiment of the present application provides an engine including a timing belt drive system.
By adopting the technical scheme, the application has the following beneficial effects:
the timing belt transmission structure provided by the embodiment of the application determines the real-time torque of the camshaft through the torque sensor, provides the camshaft correction torque by using the motor, changes the fluctuating camshaft torque into the stable torque related to the rotating speed, and enables the timing belt to be in a lower tension level in the working period.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a timing belt transmission structure according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a timing belt transmission structure according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart illustrating a method for adjusting camshaft torque according to an embodiment of the present disclosure;
FIG. 4 is a camshaft torque correction curve illustrating an embodiment of the present application;
the following is a supplementary description of the drawings:
1-camshaft pulley; 2-an electric motor; 3-a worm gear; 4-a worm; 5-one-way bearing; .
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. 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 application.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the present application. In the description of the embodiments of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a timing belt transmission structure according to an embodiment of the present application, where the timing belt transmission structure includes a camshaft pulley 1, a camshaft, a motor 2, a worm gear structure, and a torque sensor; FIG. 2 is a view of a timing belt drive configuration of an embodiment of the present application taken in a direction opposite to that of FIG. 1;
the motor 2 can drive a worm and gear structure;
the worm gear structure comprises a worm wheel 3;
the worm wheel 3 and the camshaft belt pulley 1 are sleeved on the camshaft, and the worm wheel 3 is connected with the camshaft belt pulley 1; the worm wheel 3 can drive a camshaft to rotate, and the camshaft can drive the camshaft belt pulley 1 to rotate;
the torque sensor is arranged in the camshaft and can acquire the torque of the camshaft.
According to the embodiment of the application, the torque of the camshaft is measured in real time through the torque sensor, the torque of the camshaft under different rotating speeds and loads can be intelligently identified, the motor 2 provides a camshaft correction torque, and the fluctuating torque of the camshaft is changed into a stable torque related to the rotating speed; the timing system is enabled to be in a lower tension level in the working period, and NVH performance is guaranteed not to be affected.
According to the embodiment of the application, a worm and gear structure driven by a power-assisted motor 2 is added on the basis of a traditional camshaft belt pulley 1, and the camshaft belt pulley 1 is directly connected with a timing belt under the conventional condition and is driven by the timing belt to transmit the motion of an engine crankshaft to a camshaft; the worm wheel 3 is connected with the camshaft belt wheel through a one-way bearing 5 or a transmission pair with a one-way locking function. The locking direction of the one-way bearing 5 or the transmission pair is consistent with the rotation direction of the camshaft of the engine, and meanwhile, the worm gear and worm structure has a self-locking effect, namely the worm gear 3 can drive the camshaft to rotate in the positive direction (the normal rotation direction of the engine), and the engine is organized to find rotation. Meanwhile, if the engine is in a stop state, the worm and gear structure allows the engine to freely rotate in the forward direction and prevents the engine from rotating in the reverse direction, and the problem of tooth skipping of a timing system caused by reverse turning of the engine is further prevented.
In the embodiment of the application, the worm and gear structure further comprises a worm 4, the motor 2 is connected with the worm 4, and the worm 4 is connected with the worm wheel 3 in a matching mode.
A second aspect of an embodiment of the present application provides a timing belt transmission system, which is a closed-loop control system; the timing belt transmission system comprises a control module and a timing belt transmission structure;
the torque sensor is connected with the control module; the control module is connected with the motor 2;
the torque sensor can transmit real-time torque of the camshaft to the control module;
the control module can output a compensation torque value required to be provided by the motor 2 according to the real-time torque of the camshaft and the camshaft calibration torque arranged in the control module;
the motor 2 can perform torque correction on the camshaft according to the compensation torque value.
In the embodiment of the present application, the motor 2 can perform torque correction on the camshaft according to the compensation torque value, and includes:
the motor 2 drives the worm wheel 3 to rotate according to the compensation torque value, and the worm wheel 3 drives the camshaft to rotate so as to carry out torque correction on the camshaft.
The engine camshaft torque is mainly related to the engine rotating speed and the spring force, and after the engine valve mechanism is designed and shaped, the camshaft basic torque at different rotating speeds can be calibrated through actual measurement and simulation analysis to obtain the camshaft calibration torque. The camshaft torque condition is monitored in real time through a torque sensor arranged in the camshaft in the running process of the engine, the camshaft torque condition is compared with the camshaft calibration torque in the control module, real-time correction is provided for the camshaft torque through closed-loop control, and the camshaft torque is in a stable state.
In the embodiment of the application, the system controls the motor 2 to provide the correction torque based on the closed-loop control system, and the resonance point can be excluded from the range of the rotating speed of the engine;
the embodiment of the application refers to closed-loop control, which is a basic concept of control theory. Refers to a control relationship in which the output as controlled is returned to the input as control in a manner and exerts a control influence on the input. And (3) a system control mode with feedback information. When the operator starts the system, the control information is transmitted to the controlled object through the system operation, and the state information of the controlled object is fed back to the input to correct the operation process, so that the output of the system meets the expected requirement.
In a third aspect of the embodiments of the present application, there is provided a method for adjusting a torque of a camshaft, where fig. 3 is a schematic flow chart of the method, and includes the following steps:
s1, acquiring the real-time torque of the camshaft by using a torque sensor in the camshaft, and sending the real-time torque of the camshaft to a control module through the torque sensor;
s2, the control module outputs a compensation torque value which needs to be provided by the motor 2 according to the real-time torque of the camshaft and the camshaft calibration torque arranged in the control module;
and S3, controlling the motor 2 to adjust the camshaft torque according to the compensation torque value.
In the embodiment of the present application, the controlling the electric motor 2 adjusts the camshaft torque according to the compensation torque value, including:
the control motor 2 drives the worm wheel 3 to rotate according to the compensation torque value, and the worm wheel 3 drives the camshaft to rotate so as to adjust the torque of the camshaft.
The engine camshaft torque is mainly related to the engine rotating speed and the spring force, and after the engine valve mechanism is designed and shaped, the camshaft basic torque at different rotating speeds can be calibrated through actual measurement and simulation analysis to obtain the camshaft calibration torque. The camshaft torque condition is monitored in real time through a torque sensor arranged in the camshaft in the running process of the engine, the camshaft torque condition is compared with the camshaft calibration torque in the control module, real-time correction is provided for the camshaft torque through closed-loop control, and the camshaft torque is in a stable state.
FIG. 4 is a schematic diagram of torque correction in the embodiment of the present application, in which a solid line is a camshaft calibration torque, a dotted line is a camshaft real-time torque, and a difference between the real-time torque and the calibration torque is a compensation torque value.
In the prior art, the design of a non-circular wheel is influenced by inherent characteristics of a timing system arrangement scheme and other systems, and a resonance point of a timing system is likely to move forward to a common rotating speed of an engine on the basis of reducing the peak torque of the timing system, so that the NVH performance is deteriorated and the system risk is improved. The method for adjusting the torque of the camshaft in the embodiment of the application controls the motor 2 to provide the correction torque based on closed-loop control, and can exclude the resonance point from the range of the rotating speed of the engine;
a fourth aspect of embodiments of the present application provides an engine including a timing belt drive structure.
A fifth aspect of an embodiment of the present application provides an engine including a timing belt drive system.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (10)
1. A timing belt transmission structure is characterized by comprising a camshaft belt pulley (1), a camshaft, a motor (2), a worm gear structure and a torque sensor;
the motor (2) can drive the worm and gear structure;
the worm and gear structure comprises a worm wheel (3);
the worm wheel (3) and the camshaft belt pulley (1) are sleeved on the camshaft, and the worm wheel (3) is connected with the camshaft belt pulley (1); the worm wheel (3) can drive the camshaft to rotate, and the camshaft can drive the camshaft pulley (1) to rotate;
the torque sensor is arranged in the camshaft and can acquire the torque of the camshaft.
2. The timing belt transmission structure according to claim 1, further comprising a one-way bearing (5); the worm wheel (3) is connected with the camshaft belt pulley (1) through the one-way bearing (5).
3. The timing belt drive structure according to claim 1, further comprising a drive pair through which the worm wheel (3) and the camshaft pulley (1) are connected.
4. The timing belt transmission structure according to claim 1, characterized in that the worm gear structure further comprises a worm (4), the electric motor (2) is connected with the worm (4), and the worm (4) is in fit connection with the worm wheel (3).
5. A timing belt drive system, characterized in that the timing belt drive system is a closed loop control system; the timing belt drive system comprises a control module and the timing belt drive structure of any one of claims 1-4;
the torque sensor is connected with the control module; the control module is connected with the motor (2);
the torque sensor can transmit real-time torque of the camshaft to the control module;
the control module can output a compensation torque value required to be provided by the motor (2) according to the real-time torque of the camshaft and the camshaft calibration torque arranged in the control module;
the electric motor (2) can perform torque correction on the camshaft according to the compensation torque value.
6. A timing belt drive system according to claim 5, characterized in that the electric motor (2) is capable of torque correcting the camshaft in dependence on the compensation torque value, comprising:
the motor (2) drives the worm wheel (3) to rotate according to the compensation torque value, and the worm wheel (3) drives the camshaft to rotate so as to carry out torque correction on the camshaft.
7. A method of adjusting camshaft torque, comprising the steps of:
acquiring real-time torque of a camshaft by using a torque sensor in the camshaft, and sending the real-time torque of the camshaft to a control module through the torque sensor;
controlling the control module to output a compensation torque value required to be provided by a motor (2) according to the real-time torque of the camshaft and the camshaft calibration torque arranged in the control module;
and controlling the motor (2) to adjust the camshaft torque according to the compensation torque value.
8. The camshaft torque adjustment method according to claim 7, wherein the controlling the electric motor (2) to adjust the camshaft torque according to the compensation torque value includes:
and controlling the motor (2) to drive the worm wheel (3) to rotate according to the compensation torque value, wherein the worm wheel (3) drives the camshaft to rotate so as to adjust the torque of the camshaft.
9. An engine comprising the timing belt transmission structure according to any one of claims 1 to 4.
10. An engine comprising the timing belt drive system of any one of claims 5-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010507028.XA CN111828120B (en) | 2020-06-05 | 2020-06-05 | Transmission structure, system, camshaft torque adjusting method and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010507028.XA CN111828120B (en) | 2020-06-05 | 2020-06-05 | Transmission structure, system, camshaft torque adjusting method and engine |
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| Publication Number | Publication Date |
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| CN111828120A true CN111828120A (en) | 2020-10-27 |
| CN111828120B CN111828120B (en) | 2021-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010507028.XA Active CN111828120B (en) | 2020-06-05 | 2020-06-05 | Transmission structure, system, camshaft torque adjusting method and engine |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86103823A (en) * | 1986-05-20 | 1987-12-02 | 弗雷德里克·迈克尔·斯蒂沃西 | Variable rotary devices |
| KR20090061292A (en) * | 2007-12-11 | 2009-06-16 | 현대자동차주식회사 | Variable valve lift and timing apparatus |
| CN107605992A (en) * | 2017-11-17 | 2018-01-19 | 梁琼 | A kind of cam-type automatic clutch actuator and its execution method |
| CN109944656A (en) * | 2017-12-20 | 2019-06-28 | 福特全球技术公司 | Variable cam timing system and method for operating the system |
-
2020
- 2020-06-05 CN CN202010507028.XA patent/CN111828120B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86103823A (en) * | 1986-05-20 | 1987-12-02 | 弗雷德里克·迈克尔·斯蒂沃西 | Variable rotary devices |
| KR20090061292A (en) * | 2007-12-11 | 2009-06-16 | 현대자동차주식회사 | Variable valve lift and timing apparatus |
| CN107605992A (en) * | 2017-11-17 | 2018-01-19 | 梁琼 | A kind of cam-type automatic clutch actuator and its execution method |
| CN109944656A (en) * | 2017-12-20 | 2019-06-28 | 福特全球技术公司 | Variable cam timing system and method for operating the system |
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| CN111828120B (en) | 2021-10-26 |
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