CN106150585B - Control method and device of continuous variable valve lift mechanism - Google Patents
Control method and device of continuous variable valve lift mechanism Download PDFInfo
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- CN106150585B CN106150585B CN201510209236.0A CN201510209236A CN106150585B CN 106150585 B CN106150585 B CN 106150585B CN 201510209236 A CN201510209236 A CN 201510209236A CN 106150585 B CN106150585 B CN 106150585B
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Abstract
The control method and the device for the continuous variable valve lift mechanism can avoid strong impact between the limiting surface of the mechanism and a mechanical dead point, thereby reducing the abrasion to parts of the mechanism, ensuring the control precision of the mechanism and improving the sound quality of an engine. The method comprises the following steps: determining whether the valve reaches a first lift or a second lift; the first lift is a lift which is away from the maximum lift of the valve by a first preset value, and the second lift is a lift which is away from the minimum lift of the valve by a second preset value; if the valve reaches the first lift or the second lift, acquiring a first rotating speed of a driving motor of the continuous variable valve lift mechanism, and adjusting the rotating speed of the driving motor to a second rotating speed; wherein the second rotational speed is less than the first rotational speed. The invention is suitable for the technical field of control.
Description
Technical Field
The invention relates to the technical field of control, in particular to a control method and a control device of a continuous variable valve lift mechanism.
Background
The continuous variable valve lift mechanism can enable the valve lift to be continuously changed in a certain range, so that compared with a conventional variable valve lift mechanism, the continuous variable valve lift mechanism is more flexible in control of the air inflow of an engine, and can effectively reduce pumping loss under partial load, thereby improving fuel economy.
Due to the complex structure of the continuously variable valve lift mechanism, an Electronic Control Unit (ECU) needs to realize accurate Control of the valve lift based on high mechanism Control precision and intake measurement precision. In the existing control method of the continuous variable valve lift mechanism, in the process of adjusting the valve lift, in order to realize the rapid adjustment of the valve, the limit surface of the mechanism and a mechanical stop point are often strongly impacted. On the one hand, this causes wear to the components of the mechanism, which leads to a reduction in the service life of the mechanism, and in turn causes a shift in the position of the mechanical stop of the mechanism, which leads to a reduction in the control accuracy of the mechanism by the ECU. On the other hand, when the limit surface of the mechanism collides with the mechanical dead point, the Noise Vibration roughness (NVH) problem of the mechanism is serious, and the NVH performance is reduced.
Disclosure of Invention
In view of this, the present invention is directed to a method and an apparatus for controlling a continuously variable valve lift mechanism, so as to avoid a strong impact between a limiting surface of the mechanism and a mechanical stop, thereby reducing wear on components of the mechanism, ensuring control accuracy of the mechanism, and improving acoustic quality of an engine.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control method of a continuously variable valve lift mechanism, comprising:
determining whether the valve reaches a first lift or a second lift; the first lift is a lift which is away from the maximum lift of the valve by a first preset value, and the second lift is a lift which is away from the minimum lift of the valve by a second preset value;
if the valve reaches the first lift or the second lift, acquiring a first rotating speed of a driving motor of the continuous variable valve lift mechanism, and adjusting the rotating speed of the driving motor to a second rotating speed; wherein the second rotational speed is less than the first rotational speed.
Further, the method further comprises:
determining whether the driving motor is locked;
if the driving motor is determined not to be locked, controlling the driving motor to step;
if the driving motor is determined to be locked, judging whether the continuous variable valve lift mechanism reaches a mechanical stop point;
and if the continuous variable valve lift mechanism is determined to reach the mechanical stop point, controlling the driving motor to stop stepping.
Preferably, the determining whether the continuously variable valve lift mechanism reaches a mechanical dead point includes:
judging whether the current of the driving motor exceeds a first preset current value or is maintained at a second preset current value for a preset time; if the current of the driving motor exceeds the first preset current value or is maintained at the second preset current value for a preset time, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, determining that the continuous variable valve lift mechanism does not reach a mechanical dead point;
alternatively, the first and second electrodes may be,
detecting whether the driving motor acts or not, and judging whether the voltage of the driving motor is within a preset range or not; if the driving motor does not act and the voltage of the driving motor is within the preset range, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, determining that the continuous variable valve lift mechanism does not reach the mechanical dead point.
Further, after the determining whether the continuous variable valve lift mechanism reaches the mechanical dead point, the method further includes:
if the continuous variable valve lift mechanism is determined not to reach a mechanical stop point, determining a first lift direction of the valve, and controlling the driving motor to drive the valve to move along a second lift direction for a preset distance and then move along the first lift direction; wherein the first lift direction is a direction from the maximum lift to the minimum lift or a direction from the minimum lift to the maximum lift, and the second lift direction is opposite to the first lift direction;
if the first lift direction is a direction from the maximum lift to the minimum lift, judging whether the valve can move to the minimum lift along the first lift direction; alternatively, the first and second electrodes may be,
if the first lift direction is a direction from the minimum lift to the maximum lift, judging whether the valve can move to the maximum lift along the first lift direction;
if the valve is determined to be capable of moving to the minimum lift along the first lift direction, controlling the driving motor to stop stepping after the valve moves to the minimum lift; or, if it is determined that the valve can move to the maximum lift along the first lift direction, after the valve moves to the maximum lift, controlling the driving motor to stop stepping.
Further, after the determining whether the valve can move in the first lift direction to the minimum lift or whether the valve can move in the first lift direction to the maximum lift, the method further includes:
if the valve cannot move to the minimum lift along the first lift direction, or if the valve cannot move to the maximum lift along the first lift direction, starting an engine to operate the continuous variable valve lift mechanism;
if the first lift direction is a direction from the maximum lift to the minimum lift, judging whether the valve can move to the minimum lift along the first lift direction; or, if the first lift direction is a direction from the minimum lift to the maximum lift, judging whether the valve can move to the maximum lift along the first lift direction;
if the valve is determined to be capable of moving to the minimum lift along the first lift direction, controlling the driving motor to stop stepping after the valve moves to the minimum lift; or, if it is determined that the valve can move to the maximum lift along the first lift direction, after the valve moves to the maximum lift, controlling the driving motor to stop stepping.
In the prior art, in order to realize the rapid adjustment of the valve, the limiting surface of the mechanism and a mechanical dead point are often strongly impacted. On the one hand, this causes wear to the components of the mechanism, which leads to a reduction in the service life of the mechanism, and in turn causes a shift in the position of the mechanical stop of the mechanism, which leads to a reduction in the control accuracy of the mechanism by the ECU. On the other hand, the impact between the limiting surface of the mechanism and the mechanical dead point can cause serious NVH problem of the mechanism and the reduction of NVH performance. When the control method of the continuous variable valve lift mechanism determines that the valve reaches a first lift which is a first preset value away from the maximum lift of the valve or a second lift which is a second preset value away from the minimum lift of the valve (namely when the valve is close to the maximum lift or the minimum lift), the control method firstly obtains a first rotating speed of a driving motor of the continuous variable valve lift mechanism, and then adjusts the rotating speed of the driving motor to a second smaller rotating speed. Therefore, compared with the prior art, the control method of the continuous variable valve lift mechanism can enable the mechanism to reach the mechanical stop point softly, so that the limit surface of the mechanism is prevented from being impacted with the mechanical stop point strongly, the abrasion to parts of the mechanism is reduced, the control precision of the mechanism is ensured, and the sound quality of an engine is improved.
Another objective of the present invention is to provide a control device for a continuously variable valve lift mechanism, so as to avoid the strong impact between the limiting surface of the mechanism and the mechanical stop point, thereby reducing the wear on the components of the mechanism, ensuring the control accuracy of the mechanism, and improving the sound quality of the engine.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a control apparatus of a continuously variable valve lift mechanism, comprising: the device comprises a first determining unit, an obtaining unit and an adjusting unit;
the first determination unit is used for determining whether the valve reaches a first lift or a second lift; the first lift is a lift which is away from the maximum lift of the valve by a first preset value, and the second lift is a lift which is away from the minimum lift of the valve by a second preset value;
the obtaining unit is used for obtaining a first rotating speed of a driving motor of the continuous variable valve lift mechanism if the first determining unit determines that the valve reaches the first lift or the second lift;
the adjusting unit is used for adjusting the rotating speed of the driving motor to a second rotating speed; wherein the second rotational speed is less than the first rotational speed.
Further, the apparatus further comprises: the device comprises a second determining unit, a first judging unit and a first control unit;
the second determination unit is used for determining whether the driving motor is locked;
the first control unit is used for controlling the driving motor to step if the second determination unit determines that the driving motor is not locked;
the first judging unit is used for judging whether the continuous variable valve lift mechanism reaches a mechanical stop point or not if the second determining unit determines that the driving motor is locked;
the first control unit is further configured to control the driving motor to stop stepping if the first determination unit determines that the continuous variable valve lift mechanism reaches a mechanical stop point.
Preferably, the first judging unit is specifically configured to:
judging whether the current of the driving motor exceeds a first preset current value or is maintained at a second preset current value for a preset time; if the current of the driving motor exceeds the first preset current value or is maintained at the second preset current value for a preset time, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, determining that the continuous variable valve lift mechanism does not reach a mechanical dead point;
alternatively, the first and second electrodes may be,
detecting whether the driving motor acts or not, and judging whether the voltage of the driving motor is within a preset range or not; if the driving motor does not act and the voltage of the driving motor is within the preset range, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, determining that the continuous variable valve lift mechanism does not reach the mechanical dead point.
Further, the apparatus further comprises: a third determination unit, a second control unit and a second judgment unit;
the third determining unit is configured to determine, after the first determining unit determines whether the continuous variable valve lift mechanism reaches a mechanical stop point, a first lift direction of the valve if the first determining unit determines that the continuous variable valve lift mechanism does not reach the mechanical stop point; wherein the first lift direction is a direction pointing from the maximum lift to the minimum lift or a direction pointing from the minimum lift to the maximum lift;
the second control unit is used for controlling the driving motor to drive the valve to move in a second lift direction, which is opposite to the first lift direction, for a preset distance and then move in the first lift direction;
the second judging unit is configured to judge whether the valve can move to the minimum lift along the first lift direction if the first lift direction is a direction from the maximum lift to the minimum lift; or, if the first lift direction is a direction from the minimum lift to the maximum lift, judging whether the valve can move to the maximum lift along the first lift direction;
the first control unit is further configured to control the driving motor to stop stepping after the valve moves to the minimum lift if it is determined that the valve can move to the minimum lift along the first lift direction; or, if it is determined that the valve can move to the maximum lift along the first lift direction, after the valve moves to the maximum lift, controlling the driving motor to stop stepping.
Further, the apparatus further comprises: a start unit;
the starting unit is configured to start an engine to operate the continuously variable valve lift mechanism if the second determining unit determines that the valve cannot move in the first lift direction to the minimum lift or the maximum lift after the second determining unit determines that the valve can move in the first lift direction to the maximum lift;
the second determination unit is further configured to determine whether the valve can move to the minimum lift along the first lift direction if the first lift direction is a direction from the maximum lift to the minimum lift after the starting unit starts an engine to operate the continuously variable valve lift mechanism; or, if the first lift direction is a direction from the minimum lift to the maximum lift, determining whether the valve can move to the maximum lift along the first lift direction.
Compared with the prior art, the control device of the continuous variable valve lift mechanism and the control method of the continuous variable valve lift mechanism have the same advantages, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a continuously variable valve lift mechanism;
FIG. 2 is a first flowchart illustrating a method for controlling a continuously variable valve lift mechanism according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a second method for controlling the continuous variable valve lift mechanism according to the embodiment of the present invention;
FIG. 4 is a third schematic flowchart of a method for controlling a continuously variable valve lift mechanism according to an embodiment of the present invention;
FIG. 5 is a fourth flowchart illustrating a method for controlling a continuously variable valve lift mechanism according to an embodiment of the present invention;
FIG. 6 is a first schematic structural diagram of a control device of a continuously variable valve lift mechanism according to an embodiment of the present invention;
FIG. 7 is a second schematic structural diagram of a control device of a continuously variable valve lift mechanism according to an embodiment of the present invention;
FIG. 8 is a third schematic structural diagram of a control device of a continuously variable valve lift mechanism according to an embodiment of the present invention;
fig. 9 is a fourth structural schematic diagram of a control device of a continuously variable valve lift mechanism according to an embodiment of the present invention.
Description of reference numerals:
1-drive motor, 2-control shaft, 3-gear, 4-rotation pin, 5-cam, 6-first rocker arm, 7-roller, 8-second rocker arm, 9-roller pin, 10-valve, 11-tappet, 12-rocker arm pin, 13-valve rocker arm and 14-rack.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In addition, in order to facilitate clear description of technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish the same items or similar items with substantially the same functions and actions, and those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
An exemplary structure of the continuously variable valve lift mechanism in the present embodiment is shown in fig. 1, and includes a cam 5, and the cam 5 is connected to a roller 7 in a first rocker arm 6, one end of the first rocker arm 6 is connected to a rocker pin 12, the other end is connected to a second rocker arm 8 through a roller pin 9, and the second rocker arm 8 and a valve rocker arm 13 are connected through the rocker pin 12; one end of the valve rocker 13 is connected with the valve 10, and the other end of the valve rocker is jacked up by the tappet 11; the rocker arm pin 12 is connected with the roller pin 9 through the first rocker arm 6, a sliding rail is arranged on the second rocker arm 8, and the roller pin 9 and the rocker arm pin 12 can synchronously slide on the sliding rail of the second rocker arm 8; the second rocker arm 8 is connected with a rack 14 through a rotating pin 4, the rack 14 is meshed with a gear 3, the gear 3 is connected with a control shaft 2, and the control shaft 2 is connected with a driving motor 1.
The working principle is as follows: when the valve lift is fixed, the cam 5 drives the roller 7 to rotate and swing around the rotating pin 4, the roller 7 drives the second rocker arm 8 to swing around the rotating pin 4 as a rotating center through the roller pin 9, the second rocker arm 8 drives the rocker arm pin 12, the valve rocker arm 13 is driven to rotate around the top point of the tappet 11, and the valve 10 is driven to be periodically opened and closed in a proper lift mode; when the working point of the engine changes, the ECU sends out an instruction to control the driving motor 1 to start. The driving motor 1 drives the control shaft 2 to move, the control shaft 2 transmits the movement to the rotating pin 4 through the gear 3 and the rack 14, so that the rotating pin 4 moves synchronously, the positions of the rocker arm pin 12 and the roller pin 9 are kept unchanged, the center of the roller pin 9 is equivalent to a lever control end, the center of the rotating pin 4 is equivalent to a fulcrum, the center of the rocker arm pin 12 is equivalent to a middle point, and when the position of the control end (the roller pin 9) of the lever is unchanged and the position of the fulcrum (the rotating pin 4) is adjustable, the maximum stroke (namely the lift of the valve 12) of the middle point (the rocker arm pin 12) is changed, namely the valve lift is variable.
Of course, the continuously variable valve lift mechanism shown in fig. 1 is only one exemplary structure given in the embodiment of the present invention, and the structure of the continuously variable valve lift mechanism described in the embodiment of the present invention may have other forms, which the embodiment of the present invention is not particularly limited to.
Fig. 2 is a schematic flow chart illustrating a control method of a continuously variable valve lift mechanism according to an embodiment of the present invention, and referring to fig. 2, the method includes:
s201, the control device of the continuous variable valve lift mechanism determines whether the valve reaches a first lift or a second lift, wherein the first lift is a lift which is a first preset value away from the maximum lift of the valve, and the second lift is a lift which is a second preset value away from the minimum lift of the valve.
It should be noted that the first preset value and the second preset value need to be valued by comprehensively considering the adjustment softness and the adjustment speed, and may be specifically set by combining actual experience, and the values of the first preset value and the second preset value may be the same or different, which is not specifically limited in this embodiment of the present invention. Preferably, the first preset value and the second preset value can be 1-2 mm.
In addition, a lift sensor may be mounted on the mechanism, and whether the valve reaches the first lift/the second lift may be determined by the lift sensor. Specifically, the voltage detected by the lift sensor when the valve is in the maximum lift/the minimum lift can be recorded in advance, the voltage detected by the lift sensor is obtained in time in the valve movement process and is different from the voltage recorded in advance, and if the difference value of the two is within a preset range, the valve reaches the first lift/the second lift.
Here, another method for determining whether the valve reaches the first lift/the second lift is further provided in an embodiment of the present invention: the method comprises the steps of obtaining the number (recorded as N) of steps of a driving motor for driving the valve to move from the minimum lift to the maximum lift in advance, converting a first preset value/a second preset value into the number (recorded as M/N) of steps of a corresponding driving motor, accumulating the number (recorded as M) of steps of the driving motor when the driving motor drives the valve to move, judging whether N-M is equal to M/N, and if yes, indicating that the valve has reached the first lift/the second lift.
S202, if the fact that the valve reaches the first lift or the second lift is determined, the control device of the continuous variable valve lift mechanism obtains a first rotating speed of a driving motor of the continuous variable valve lift mechanism, and adjusts the rotating speed of the driving motor to be a second rotating speed, wherein the second rotating speed is smaller than the first rotating speed.
When the valve is close to the maximum lift or the minimum lift, the rotating speed of the driving motor is reduced to enable the mechanism to reach the mechanical dead point smoothly, and therefore the limiting surface of the mechanism is prevented from being in strong impact with the mechanical dead point.
Specifically, when the valve is close to the maximum lift or the minimum lift, the rotation speed of the driving motor can be reduced to 1/5-1/15, namely the second rotation speed can be 1/5-1/15 of the first rotation speed. Of course, in the control method of the continuously variable valve lift mechanism according to the embodiment of the present invention, the first rotation speed may not be acquired, but the second rotation speed may be stored in advance (specifically, may be obtained through experience), and when the valve approaches the maximum lift or the minimum lift, the rotation speed of the driving motor may be adjusted to the second rotation speed that is stored in advance, which is not limited in the embodiment of the present invention.
Further, as shown in fig. 3, the control method of the continuously variable valve lift mechanism according to the embodiment of the present invention may further include:
s203, the control device of the continuous variable valve lift mechanism determines whether the driving motor is locked.
And S204, if the driving motor is determined not to be locked, controlling the driving motor to step by the control device of the continuous variable valve lift mechanism.
And S205, if the driving motor is determined to be locked, judging whether the continuous variable valve lift mechanism reaches a mechanical stop point or not by the control device of the continuous variable valve lift mechanism.
And S206, if the fact that the continuous variable valve lift mechanism reaches the mechanical stop point is determined, the control device of the continuous variable valve lift mechanism controls the driving motor to stop stepping.
In the prior art, when parts of a mechanism are abraded, the precision of the mechanism is reduced along with the abrasion, so that a mechanical dead point of the mechanism is deviated, and the accuracy of the mechanism for lift control is reduced after the mechanical dead point is deviated. According to the control method of the continuous variable valve lift mechanism, whether the mechanism is locked up or not is detected at any moment, and the driving motor is controlled to continuously step after the mechanism is determined to be not locked up, so that the mechanism can reach an actual mechanical stop point, the accuracy of lift control is further ensured, and meanwhile, the mechanism self-checking at the later stage is guaranteed.
It should be noted that, as can be understood by those skilled in the art, when the mechanism reaches a mechanical dead point, the driving motor may be locked, and on one hand, the supply current after the lock is increased correspondingly, so that the ECU bears a high current load (i.e., an overload occurs), which causes overheating of the ECU and damage to the ECU; on the other hand, stalling can increase the axial force on the drive motor, which can cause performance degradation if the stall continues. The control method of the continuous variable valve lift mechanism provided by the embodiment of the invention timely detects the state of the mechanism, judges whether the mechanism reaches a mechanical stop point, and timely controls the driving motor to stop stepping after the mechanism reaches the mechanical stop point, so that the mechanism is prevented from being stuck at the mechanical stop point, the service life of the ECU is prolonged, and the performance of the driving motor is improved.
Preferably, the step S205 of determining whether the continuous variable valve lift mechanism reaches the mechanical dead point by the control device of the continuous variable valve lift mechanism may specifically include:
the control device of the continuous variable valve lift mechanism judges whether the current of the driving motor exceeds a first preset current value or is maintained at a second preset current value for a preset time; if the current of the driving motor exceeds a first preset current value or is maintained at a second preset current value for a preset time, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, determining that the continuous variable valve lift mechanism does not reach a mechanical dead point;
alternatively, the first and second electrodes may be,
the control device of the continuous variable valve lift mechanism detects whether the driving motor acts or not and judges whether the voltage of the driving motor is in a preset range or not; if the driving motor does not act and the voltage of the driving motor is within a preset range, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, it is determined that the continuously variable valve lift mechanism has not reached the mechanical dead point.
It should be noted that, as can be understood by those skilled in the art, for different mechanisms in different application environments, values of the first preset current, the second preset current and the preset time period are not the same, and may be obtained through experiments or experience, and the embodiment of the present invention is not limited thereto. For example, the first preset current may be 50A, the second preset current may be 30A, and the preset time period may be 10 ms.
It should be noted that, when the mechanism reaches a mechanical stop point, the driving motor may be locked, on one hand, the supply current may be increased correspondingly after the locking, so that the ECU may bear a high current load (i.e., an overload occurs), which may cause overheating of the ECU and damage to the ECU; on the other hand, stalling can increase the axial force on the drive motor, which can cause performance degradation if the stall continues. According to the control method of the continuous variable valve lift mechanism, the state of the mechanism is detected in time, whether the mechanism reaches a mechanical stop point is judged, and the driving motor is controlled in time to stop stepping after the mechanism reaches the mechanical stop point, so that the mechanism is prevented from being stuck at the mechanical stop point, the service life of an ECU is prolonged, and the performance of the driving motor is improved.
Further, as shown in fig. 4, the method for controlling a continuously variable valve lift mechanism according to the embodiment of the present invention, after the control device of the continuously variable valve lift mechanism determines whether the continuously variable valve lift mechanism reaches the mechanical dead point (i.e., S205), may further include:
s207, if it is determined that the continuous variable valve lift mechanism does not reach a mechanical stop point, determining a first lift direction of the valve by a control device of the continuous variable valve lift mechanism, and controlling a driving motor to drive the valve to move along a second lift direction for a preset distance and then move along the first lift direction; the first lift direction is a direction from the maximum lift to the minimum lift or a direction from the minimum lift to the maximum lift, and the second lift direction is opposite to the first lift direction.
S208a, if the first lift direction is from the maximum lift to the minimum lift, the control device of the continuous variable valve lift mechanism judges whether the valve can move to the minimum lift along the first lift direction.
Alternatively, the first and second electrodes may be,
s208b, if the first lift direction is from the minimum lift to the maximum lift, the control device of the continuous variable valve lift mechanism judges whether the valve can move to the maximum lift along the first lift direction.
S209, if the valve can move to the minimum lift along the first lift direction, after the valve moves to the minimum lift, the control device of the continuous variable valve lift mechanism controls the driving motor to stop stepping; or if the valve can move to the maximum lift along the first lift direction, and after the valve moves to the maximum lift, the control device of the continuous variable valve lift mechanism controls the driving motor to stop stepping.
That is, when the mechanism is stuck due to external factors (such as foreign matters such as impurities and dust) and the mechanism is locked without reaching the mechanical dead point, the mechanism can be returned (i.e. adjusted in the opposite direction for a certain distance) first, and then the adjustment is continued in the original direction. If the valve can be adjusted to the maximum lift or the minimum lift (depending on the motion direction of the valve before clamping stagnation), the valve indicates that foreign matters causing clamping stagnation are shaken off by returning, and the mechanism can normally operate; otherwise, it indicates that the foreign matter is still present in the mechanism and the mechanism cannot operate normally.
Further, as shown in fig. 5, the method for controlling a continuously variable valve lift mechanism according to the embodiment of the present invention may further include, after the control device of the continuously variable valve lift mechanism determines whether the valve can move in the first lift direction to the minimum lift, or after the control device of the continuously variable valve lift mechanism determines whether the valve can move in the first lift direction to the maximum lift:
and S210, if the valve cannot move to the minimum lift along the first lift direction, or if the valve cannot move to the maximum lift along the first lift direction, starting the engine by using the control device of the continuous variable valve lift mechanism to operate the continuous variable valve lift mechanism.
And then, the control device of the continuous variable valve lift mechanism judges whether the valve can move to the minimum lift along the first lift direction or whether the valve can move to the maximum lift along the first lift direction, and if so, when the valve moves to the minimum lift or the maximum lift, the control device of the continuous variable valve lift mechanism controls the driving motor to stop stepping.
That is, when the mechanism is returned to the original position and the foreign matter causing the jamming can not be shaken off, the mechanism can be operated by starting the engine, because the inside of the mechanism can generate larger vibration at the moment of the operation of the mechanism, and the lubricating property among all parts of the mechanism is better, the jamming of the mechanism can be solved by the operation mechanism, and the mechanism can normally operate.
In the prior art, in order to realize the rapid adjustment of the valve, the limiting surface of the mechanism and a mechanical dead point are often strongly impacted. On the one hand, this causes wear to the components of the mechanism, which leads to a reduction in the service life of the mechanism, and in turn causes a shift in the position of the mechanical stop of the mechanism, which leads to a reduction in the control accuracy of the mechanism by the ECU. On the other hand, the impact between the limiting surface of the mechanism and the mechanical dead point can cause serious NVH problem of the mechanism and the reduction of NVH performance.
When the control method of the continuous variable valve lift mechanism determines that the valve reaches a first lift which is a first preset value away from the maximum lift of the valve or a second lift which is a second preset value away from the minimum lift of the valve (namely when the valve is close to the maximum lift or the minimum lift), the control method firstly obtains a first rotating speed of a driving motor of the continuous variable valve lift mechanism, and then adjusts the rotating speed of the driving motor to a second smaller rotating speed. Therefore, compared with the prior art, the control method of the continuous variable valve lift mechanism can enable the mechanism to reach the mechanical stop point softly, so that the limit surface of the mechanism is prevented from being impacted with the mechanical stop point strongly, the abrasion to parts of the mechanism is reduced, the control precision of the mechanism is ensured, and the sound quality of an engine is improved.
Meanwhile, in the prior art, when parts of the mechanism are abraded, the precision of the mechanism is reduced along with the abrasion, so that the mechanical dead point of the mechanism is deviated, and the accuracy of the mechanism for lift control is reduced after the mechanical dead point is deviated. According to the control method of the continuous variable valve lift mechanism, whether the mechanism is locked up or not is detected at any moment, and the driving motor is controlled to continuously step after the mechanism is determined to be not locked up, so that the mechanism can reach an actual mechanical stop point, the accuracy of lift control is further ensured, and meanwhile, the mechanism self-checking at the later stage is guaranteed.
In addition, when the mechanism reaches a mechanical stop point, the driving motor can generate stalling, on one hand, the power supply current can be correspondingly increased after stalling, so that the ECU bears high current load (namely overload occurs), the ECU is overheated, and the ECU is damaged; on the other hand, stalling can increase the axial force on the drive motor, which can cause performance degradation if the stall continues. According to the control method of the continuous variable valve lift mechanism, the state of the mechanism is detected in time, whether the mechanism reaches a mechanical stop point is judged, and the driving motor is controlled in time to stop stepping after the mechanism reaches the mechanical stop point, so that the mechanism is prevented from being stuck at the mechanical stop point, the service life of an ECU is prolonged, and the performance of the driving motor is improved.
Fig. 6 is a schematic structural diagram of a control device 60 of a continuously variable valve lift mechanism according to an embodiment of the present invention, and referring to fig. 6, the device includes: a first determination unit 601, an acquisition unit 602, and an adjustment unit 603.
The first determining unit 601 is used for determining whether the valve reaches the first lift or the second lift; the first lift is a lift which is away from the maximum lift of the valve by a first preset value, and the second lift is a lift which is away from the minimum lift of the valve by a second preset value.
An obtaining unit 602, configured to obtain a first rotation speed of a driving motor of the continuously variable valve lift mechanism if the first determining unit 601 determines that the valve reaches the first lift or the second lift.
An adjusting unit 603 for adjusting the rotation speed of the driving motor to a second rotation speed; wherein the second rotation speed is less than the first rotation speed.
Further, as shown in fig. 7, the control device 60 of the continuously variable valve lift mechanism according to the embodiment of the present invention may further include: a second determination unit 604, a first judgment unit 605, and a first control unit 606.
Wherein the second determination unit 604 is configured to determine whether the driving motor is locked.
And the first control unit 606 is configured to control the driving motor to step if the second determining unit 604 determines that the driving motor is not locked.
A first judging unit 605, configured to judge whether the continuous variable valve lift mechanism reaches the mechanical dead point if the second determining unit 604 determines that the driving motor is locked.
The first control unit 606 is further configured to control the driving motor to stop stepping if the first determining unit 605 determines that the continuous variable valve lift mechanism reaches the mechanical dead point.
Preferably, the first determining unit 605 is specifically configured to:
judging whether the current of the driving motor exceeds a first preset current value or is maintained at a second preset current value for a preset time; if the current of the driving motor exceeds a first preset current value or is maintained at a second preset current value for a preset time, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, determining that the continuous variable valve lift mechanism does not reach a mechanical dead point;
alternatively, the first and second electrodes may be,
detecting whether the driving motor acts or not, and judging whether the voltage of the driving motor is within a preset range or not; if the driving motor does not act and the voltage of the driving motor is within a preset range, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, it is determined that the continuously variable valve lift mechanism has not reached the mechanical dead point.
Further, as shown in fig. 8, the control device 60 of the continuously variable valve lift mechanism according to the embodiment of the present invention may further include: a third determination unit 607, a second control unit 608, a second judgment unit 609.
The third determining unit 607 is configured to determine, after the first determining unit 605 determines whether the continuous variable valve lift mechanism reaches the mechanical dead point, if the first determining unit 605 determines that the continuous variable valve lift mechanism does not reach the mechanical dead point, the first lift direction of the valve; wherein the first lift direction is a direction from a maximum lift to a minimum lift or a direction from a minimum lift to a maximum lift.
And a second control unit 608, configured to control the driving motor to drive the valve to move in the first lift direction after moving in the second lift direction by a preset distance, where the second lift direction is opposite to the first lift direction.
The second judging unit 609 is configured to judge whether the valve can move to the minimum lift along the first lift direction if the first lift direction is a direction from the maximum lift to the minimum lift; or, if the first lift direction is a direction from the minimum lift to the maximum lift, judging whether the valve can move to the maximum lift along the first lift direction.
The first control unit 606 is further configured to control the driving motor to stop stepping after the valve moves to the minimum lift if the second determination unit 609 determines that the valve can move to the minimum lift along the first lift direction; or, if the second determining unit 609 determines that the valve can move to the maximum lift along the first lift direction, after the valve moves to the maximum lift, the driving motor is controlled to stop stepping.
Further, as shown in fig. 8, the control device 60 of the continuously variable valve lift mechanism according to the embodiment of the present invention may further include: the unit 610 is started.
And an activating unit 610, configured to, after the second determining unit 609 determines whether the valve can move in the first lift direction to the minimum lift, or after the second determining unit 609 determines whether the valve can move in the first lift direction to the maximum lift, if the second determining unit 604 determines that the valve cannot move in the first lift direction to the minimum lift or the maximum lift, start the engine to operate the continuously variable valve lift mechanism.
The second judging unit 604, configured to judge whether the valve can move to the minimum lift along the first lift direction if the first lift direction is a direction from the maximum lift to the minimum lift after the starting unit 610 starts the engine to operate the continuous variable valve lift mechanism; or, if the first lift direction is a direction from the minimum lift to the maximum lift, judging whether the valve can move to the maximum lift along the first lift direction.
Specifically, the method for controlling the continuous variable valve lift mechanism by using the control device 60 of the continuous variable valve lift mechanism according to the embodiment of the present invention may refer to the related description of the embodiment of the present invention, and will not be described herein again.
In the prior art, in order to realize the rapid adjustment of the valve, the limiting surface of the mechanism and a mechanical dead point are often strongly impacted. On the one hand, this causes wear to the components of the mechanism, which leads to a reduction in the service life of the mechanism, and in turn causes a shift in the position of the mechanical stop of the mechanism, which leads to a reduction in the control accuracy of the mechanism by the ECU. On the other hand, the impact between the limiting surface of the mechanism and the mechanical dead point can cause serious NVH problem of the mechanism and the reduction of NVH performance. When the control device of the continuous variable valve lift mechanism determines that the valve reaches a first lift which is a first preset value away from the maximum lift of the valve or a second lift which is a second preset value away from the minimum lift of the valve (namely when the valve is close to the maximum lift or the minimum lift), the control device of the continuous variable valve lift mechanism firstly obtains a first rotating speed of a driving motor of the continuous variable valve lift mechanism, and then adjusts the rotating speed of the driving motor to a second smaller rotating speed. Therefore, compared with the prior art, the control method of the continuous variable valve lift mechanism can enable the mechanism to reach the mechanical stop point softly, so that the limit surface of the mechanism is prevented from being impacted with the mechanical stop point strongly, the abrasion to parts of the mechanism is reduced, the control precision of the mechanism is ensured, and the sound quality of an engine is improved.
Meanwhile, in the prior art, when parts of the mechanism are abraded, the precision of the mechanism is reduced along with the abrasion, so that the mechanical dead point of the mechanism is deviated, and the accuracy of the mechanism for lift control is reduced after the mechanical dead point is deviated. According to the control device of the continuous variable valve lift mechanism, whether the mechanism is locked up or not is detected at any moment, and the driving motor is controlled to continuously step after the mechanism is determined to be not locked up, so that the mechanism can reach an actual mechanical stop point, the accuracy of lift control is further ensured, and meanwhile, the self-checking of the mechanism at the later stage is guaranteed.
In addition, when the mechanism reaches a mechanical stop point, the driving motor can generate stalling, on one hand, the power supply current can be correspondingly increased after stalling, so that the ECU bears high current load (namely overload occurs), the ECU is overheated, and the ECU is damaged; on the other hand, stalling can increase the axial force on the drive motor, which can cause performance degradation if the stall continues. According to the control device of the continuous variable valve lift mechanism, the state of the mechanism is detected in time, whether the mechanism reaches a mechanical stop point is judged, and the driving motor is controlled in time to stop stepping after the mechanism reaches the mechanical stop point, so that the mechanism is prevented from being stuck at the mechanical stop point, the service life of an ECU is prolonged, and the performance of the driving motor is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method of controlling a continuously variable valve lift mechanism, the method comprising:
determining whether the valve reaches a first lift or a second lift; the first lift is a lift which is away from the maximum lift of the valve by a first preset value, and the second lift is a lift which is away from the minimum lift of the valve by a second preset value;
if the valve reaches the first lift or the second lift, acquiring a first rotating speed of a driving motor of the continuous variable valve lift mechanism, and adjusting the rotating speed of the driving motor to a second rotating speed; wherein the second rotation speed is less than the first rotation speed, and the driving motor is used for adjusting the lift of the valve.
2. The method of claim 1, further comprising:
determining whether the driving motor is locked;
if the driving motor is determined not to be locked, controlling the driving motor to step;
if the driving motor is determined to be locked, judging whether the continuous variable valve lift mechanism reaches a mechanical stop point;
and if the continuous variable valve lift mechanism is determined to reach the mechanical stop point, controlling the driving motor to stop stepping.
3. The method of claim 2, wherein the determining whether the continuously variable valve lift mechanism reaches mechanical dead center comprises:
judging whether the current of the driving motor exceeds a first preset current value or is maintained at a second preset current value for a preset time; if the current of the driving motor exceeds the first preset current value or is maintained at the second preset current value for a preset time, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, determining that the continuous variable valve lift mechanism does not reach a mechanical dead point;
alternatively, the first and second electrodes may be,
detecting whether the driving motor acts or not, and judging whether the voltage of the driving motor is within a preset range or not; if the driving motor does not act and the voltage of the driving motor is within the preset range, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, determining that the continuous variable valve lift mechanism does not reach the mechanical dead point.
4. The method according to claim 2 or 3, characterized by, after said determining whether the continuously variable valve lift mechanism reaches mechanical dead center, further comprising:
if the continuous variable valve lift mechanism is determined not to reach a mechanical stop point, determining a first lift direction of the valve, and controlling the driving motor to drive the valve to move along a second lift direction for a preset distance and then move along the first lift direction; wherein the first lift direction is a direction from the maximum lift to the minimum lift or a direction from the minimum lift to the maximum lift, and the second lift direction is opposite to the first lift direction;
if the first lift direction is a direction from the maximum lift to the minimum lift, judging whether the valve can move to the minimum lift along the first lift direction; alternatively, the first and second electrodes may be,
if the first lift direction is a direction from the minimum lift to the maximum lift, judging whether the valve can move to the maximum lift along the first lift direction;
if the valve is determined to be capable of moving to the minimum lift along the first lift direction, controlling the driving motor to stop stepping after the valve moves to the minimum lift; or, if it is determined that the valve can move to the maximum lift along the first lift direction, after the valve moves to the maximum lift, controlling the driving motor to stop stepping.
5. The method of claim 4, wherein after the determining whether the valve is movable in the first lift direction to the minimum lift or the determining whether the valve is movable in the first lift direction to the maximum lift, further comprising:
if the valve cannot move to the minimum lift along the first lift direction, or if the valve cannot move to the maximum lift along the first lift direction, starting an engine to operate the continuous variable valve lift mechanism;
if the first lift direction is a direction from the maximum lift to the minimum lift, judging whether the valve can move to the minimum lift along the first lift direction; or, if the first lift direction is a direction from the minimum lift to the maximum lift, judging whether the valve can move to the maximum lift along the first lift direction;
if the valve is determined to be capable of moving to the minimum lift along the first lift direction, controlling the driving motor to stop stepping after the valve moves to the minimum lift; or, if it is determined that the valve can move to the maximum lift along the first lift direction, after the valve moves to the maximum lift, controlling the driving motor to stop stepping.
6. A control device of a continuous variable valve lift mechanism is characterized in that a driving motor is used for adjusting the lift of a valve; the device comprises: the device comprises a first determining unit, an obtaining unit and an adjusting unit;
the first determination unit is used for determining whether the valve reaches a first lift or a second lift; the first lift is a lift which is away from the maximum lift of the valve by a first preset value, and the second lift is a lift which is away from the minimum lift of the valve by a second preset value;
the obtaining unit is used for obtaining a first rotating speed of a driving motor of the continuous variable valve lift mechanism if the first determining unit determines that the valve reaches the first lift or the second lift;
the adjusting unit is used for adjusting the rotating speed of the driving motor to a second rotating speed; wherein the second rotational speed is less than the first rotational speed.
7. The apparatus of claim 6, further comprising: the device comprises a second determining unit, a first judging unit and a first control unit;
the second determination unit is used for determining whether the driving motor is locked;
the first control unit is used for controlling the driving motor to step if the second determination unit determines that the driving motor is not locked;
the first judging unit is used for judging whether the continuous variable valve lift mechanism reaches a mechanical stop point or not if the second determining unit determines that the driving motor is locked;
the first control unit is further configured to control the driving motor to stop stepping if the first determination unit determines that the continuous variable valve lift mechanism reaches a mechanical stop point.
8. The apparatus according to claim 7, wherein the first determining unit is specifically configured to:
judging whether the current of the driving motor exceeds a first preset current value or is maintained at a second preset current value for a preset time; if the current of the driving motor exceeds the first preset current value or is maintained at the second preset current value for a preset time, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, determining that the continuous variable valve lift mechanism does not reach a mechanical dead point;
alternatively, the first and second electrodes may be,
detecting whether the driving motor acts or not, and judging whether the voltage of the driving motor is within a preset range or not; if the driving motor does not act and the voltage of the driving motor is within the preset range, determining that the continuous variable valve lift mechanism reaches a mechanical stop point; otherwise, determining that the continuous variable valve lift mechanism does not reach the mechanical dead point.
9. The apparatus of claim 7 or 8, further comprising: a third determination unit, a second control unit and a second judgment unit;
the third determining unit is configured to determine, after the first determining unit determines whether the continuous variable valve lift mechanism reaches a mechanical stop point, a first lift direction of the valve if the first determining unit determines that the continuous variable valve lift mechanism does not reach the mechanical stop point; wherein the first lift direction is a direction pointing from the maximum lift to the minimum lift or a direction pointing from the minimum lift to the maximum lift;
the second control unit is used for controlling the driving motor to drive the valve to move in a second lift direction, which is opposite to the first lift direction, for a preset distance and then move in the first lift direction;
the second judging unit is configured to judge whether the valve can move to the minimum lift along the first lift direction if the first lift direction is a direction from the maximum lift to the minimum lift; or, if the first lift direction is a direction from the minimum lift to the maximum lift, judging whether the valve can move to the maximum lift along the first lift direction;
the first control unit is further configured to control the driving motor to stop stepping after the valve moves to the minimum lift if it is determined that the valve can move to the minimum lift along the first lift direction; or, if it is determined that the valve can move to the maximum lift along the first lift direction, after the valve moves to the maximum lift, controlling the driving motor to stop stepping.
10. The apparatus of claim 9, further comprising: a start unit;
the starting unit is configured to start an engine to operate the continuously variable valve lift mechanism if the second determining unit determines that the valve cannot move in the first lift direction to the minimum lift or the maximum lift after the second determining unit determines that the valve can move in the first lift direction to the maximum lift;
the second determination unit is further configured to determine whether the valve can move to the minimum lift along the first lift direction if the first lift direction is a direction from the maximum lift to the minimum lift after the starting unit starts an engine to operate the continuously variable valve lift mechanism; or, if the first lift direction is a direction from the minimum lift to the maximum lift, determining whether the valve can move to the maximum lift along the first lift direction.
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| US5572962A (en) * | 1991-12-03 | 1996-11-12 | Motive Holdings Limited | Variable valve lift mechanism for internal combustion engine |
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