CN101368519A - Engine variable valve lift mechanism capable of implementing vat destruction function and its control method - Google Patents
Engine variable valve lift mechanism capable of implementing vat destruction function and its control method Download PDFInfo
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- CN101368519A CN101368519A CNA2008102121113A CN200810212111A CN101368519A CN 101368519 A CN101368519 A CN 101368519A CN A2008102121113 A CNA2008102121113 A CN A2008102121113A CN 200810212111 A CN200810212111 A CN 200810212111A CN 101368519 A CN101368519 A CN 101368519A
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention provides a variable valve lift mechanism and the control method thereof which relate to the engine air intake field and realize the cylinder fuel cut function; the rocker arm (23) of the variable valve lift mechanism is composed of a first rocker arm (12), a second rocker arm (5) and a third arm (13); the first rocker arm (12), the second rocker arm (5) and the third rocker arm (13) are contacted with a high rotational speed cam (2) through a roller (14), a low rotational speed cam (3) and a zero-lift cam (2); the control method of the variable valve lift mechanism includes that the opening and closing of a T-shaped lock pin (17) and a short T-shaped lock pin (20) are controlled to enable the high rotational speed cam (2), the zero-lift cam (2) and the low rotational speed cam (11) to be respectively applicable to the high load and low load working conditions. The variable valve lift mechanism which adopts the technical proposal can satisfy the low rotational speed situation, high rotational speed situation and the cylinder fuel cut function in a certain situation during the operation process of the variable valve lift mechanism; thereby, the fuel energy utilization rate is improved.
Description
Technical field
The present invention relates to the automotive engine air intake system field, more particularly, relate to a kind of engine variable valve lift mechanism of realizing vat destruction function, the present invention also relates to the controlling method of the engine variable valve lift mechanism that can realize vat destruction function simultaneously.
Background technique
In short supply day by day along with petroleum resources, improve engine power performance, improve fuel availability and seem more urgent, the conventional engines valve lift is fixed, but motor air inflow demand to combustible gas under different rotating speeds is different, the slow-speed of revolution, the less air inflow that only needs low-load can satisfy the needs of engine power output, can also stop partial cylinders work in case of necessity for multicylinder engine, under the situation that satisfies power output needs, reduce fuel consumption rate, and at a high speed, high load needs bigger air inflow again, and under the high rotating speed, the motor inflationtime shortens, charging efficiency descends, conventional engines only is the equinoctial point that finds each rotating speed middle, this has just limited engine power performance in order to take into account each rotating speed operating mode, be necessary to change engine air valve lift, to satisfy the air inflow needs of motor under different rotating speeds, the specific fuel consumption of improving the engine power output performance and reducing motor.In addition, improve the engine cylinder internal combustion, significance is also arranged for the discharging that reduces the motor pollutant.At present, Variable Valve Timing all has better performance aspect engine power performance, emission performance, the fuel economy improving, but only changes the port timing of motor, also has very big narrow limitation for improving the motor overall performance, for example, cause deficiency on the cylinder intake air quantity.
Summary of the invention
A kind of engine variable valve lift mechanism of vat destruction function and method of control thereof of realizing of the present invention, its technical problem that will solve is: provide a kind of can be according to the different operating modes of motor, change valve lift, thereby can improve air current flow in the engine cylinder, promote that fuel combustion is more abundant, simultaneously can be according to engine operating condition, realize that a certain cylinder or a few cylinder realize vat destruction function when engine operation, thereby reach the motor of fuel saving, improve the motor car engine variable air valve lift apparatus of fuel energy utilization ratio.
A kind of engine variable valve lift mechanism of realizing vat destruction function of the present invention comprises camshaft, pitman arm shaft, valve, valve spring, roller, rocking arm, solenoid valve comprises the different cam of cam overhead height more than two on the returning spring, described and the corresponding camshaft in each firing chamber; The quantity of described rocking arm is corresponding with the quantity of cam; Be provided with in the described pitman arm shaft and different rocking arms can be realized the T type pin of the locking and unlocking effect, short T type lock pin and oil duct.
Returning spring guarantees that first rocking arm and the 3rd rocking arm and cam face fit tightly.
Described and the corresponding cam in each firing chamber is set to three, and being divided into high rotating speed cam, slow-speed of revolution cam and a lift is zero zero lift cam, and described high rotating speed cam is set to the structure that the cam top curve is higher than slow-speed of revolution cam; Described rocking arm is set to two, is divided into first rocking arm, second rocking arm and the 3rd rocking arm, and described first rocking arm, second rocking arm and the 3rd rocking arm contact with slow-speed of revolution cam, zero lift cam and high rotating speed cam by roller respectively.
Described rocking arm inside is provided with the circular hole that connects first rocking arm and second rocking arm, the circular hole installation that is positioned at first rocking arm, one end sets out the oil duct that extends first rocking arm from T type pin head one end, on the pitman arm shaft of oil duct opposite position on first rocking arm, be provided with along the pitman arm shaft oil trap in one week; Described rocking arm inside is provided with the circular hole that connects second rocking arm and the 3rd rocking arm, short T type lock pin is installed in the circular hole, the oil duct of second rocking arm is extended in the end setting that short T type lock pin shoulder extends to second rocking arm, on the corresponding pitman arm shaft of the oil duct of second rocking arm, be provided with along the pitman arm shaft oil trap in one week.
Pocketed springs on the described T type pin, spring one end are resisted against T type pin head, and the other end is resisted against on the Roller Shaft, and T type pin keeps not extending to the position in the second rocking arm zone; One end of described short T type lock pin is resisted against on the 3rd rocking arm, and the other end and short T type lock pin are resisted against the short T type lock pin return spring on the interior Roller Shaft of second rocking arm, and short T type lock pin remains on the position of locking second rocking arm and the 3rd rocking arm.
Described oil trap and the pitman arm shaft center oilhole A that connects with oil duct connects, and pitman arm shaft center oilhole A and working connection UNICOM are provided with the solenoid valve of controlling oil pressure between described pitman arm shaft center oilhole A and the working connection.
Described oil trap and the pitman arm shaft center oilhole B that connects with oil duct connects, and pitman arm shaft center oilhole B is connected with working connection, and the solenoid valve of control oil pressure is set between described pitman arm shaft center oilhole B and the working connection.
The present invention also relates to a kind of controlling method that realizes the variable air valve lift range mechanism of vat destruction function simultaneously, ECU waits the switching of control electromagnetic valve according to actual engine speed, load, thereby change the oil pressure of pitman arm shaft center oilhole A (16) by control electromagnetic valve, and then make T type pin (17) realize the switching of lock and unlock function, and, can make short T type lock pin (20) realize the lock and unlock functional movement by changing the oil pressure of pitman arm shaft center oilhole B (30).
The controlling method of the variable air valve lift range mechanism of vat destruction function that realizes of the present invention is:
A) when parameters such as engine speed, load are lower than preset value, the solenoid valve of Control of Automobile engine variable valve lift mechanism oil circuit is in closed condition, and first rocking arm and second rocking arm of described variable air valve stroke mechanism of car engine move independently of one another;
B) when parameters such as engine speed, load are higher than preset value, the solenoid valve of Control of Automobile engine variable valve lift mechanism oil circuit is opened, described variable air valve stroke mechanism of car engine solenoid valve is opened, and T type pin locks together first rocking arm and second rocking arm;
C) moving, second rocking arm and the 3rd rocking arm unlock.In the time of need closing certain or certain several cylinder, change the oil pressure of pitman arm shaft center oilhole B, promote short T type lock pin to short T type lock pin return spring one end by the ECU control electromagnetic valve
Described motor is when the slow-speed of revolution, low-load, and T type pin is in initial position, and described first rocking arm and second rocking arm move independently of one another, and what determine the valve lift height this moment is slow-speed of revolution cam; When described motor car engine is in high rotating speed, the solenoid valve of Control of Automobile engine variable valve lift mechanism oil circuit is opened; the oil pressure of pitman arm shaft center oilhole A raises; propagation of pressure is to T type pin bottom; machine oil promotion T type pin inserts the locking hole on second rocking arm; first rocking arm and second rocking arm are locked in together, and what determined valve lift this moment is high rotating speed cam; When described motor car engine is closed certain or certain several cylinder at needs, change the oil pressure of pitman arm shaft center oilhole B by the ECU control electromagnetic valve, promoting short T type lock pin moves to short T type lock pin return spring one end, thereby make first rocking arm, second rocking arm and the 3rd rocking arm detaching motion, what determine the valve lift height this moment is the zero lift cam.
Adopt the engine variable valve lift device of technical solution of the present invention, go for the control of a plurality of valves, in the variable air valve lift apparatus working procedure, when motor is in lower-speed state, motor two valve lift differences, each valve circulation area difference, therefore two valve capacities are also different, this has improved air current flow in the engine cylinder to a certain extent, promotes the abundant mixing of fuel and air, makes fuel combustion more abundant.The engine valve aperture reaches maximum when being converted to high-lift, and this moment, the motor impact coefficient increased, and had improved power, the fuel energy utilization ratio of motor, had reduced the discharge amount of motor pollutant.
Description of drawings
Below expressed content of each width of cloth accompanying drawing in the specification of the present invention and the mark among the figure are made brief description:
Fig. 1 is the structural representation of the camshaft of variable air valve lift range mechanism of the present invention;
Fig. 2 is the forward sight structural representation of variable air valve lift range mechanism of the present invention;
Fig. 3 is the backsight structural representation of variable air valve lift range mechanism of the present invention;
Fig. 4 is the internal oil passages structural representation of the pitman arm shaft of variable air valve lift range mechanism of the present invention;
The structural representation of the zero lift state of Fig. 5 variable air valve lift range mechanism of the present invention;
Fig. 6 is the structural representation of the low lift state of variable air valve lift range mechanism of the present invention;
Fig. 7 is the structural representation of the high lift state of variable air valve lift range mechanism of the present invention;
Fig. 8 is the assembly structure decomposing schematic representation of variable air valve lift range mechanism of the present invention;
Be labeled as among the figure: 1, High speed cam; 2, zero lift cam; 3, Lower speed cam; 4, camshaft; 5, second rocking arm; 6, pitman arm shaft; 7, check ring; 8, returning spring abaculus; 9, valve; 10, valve spring; 11, returning spring; 12, first rocking arm; 13, the 3rd rocking arm; 14, roller; 15, bolt is regulated in the valve clearance; 16, pitman arm shaft center oilhole A; 17, T type pin; 18, T type lock pin return spring; 19, roller axle sleeve; 20, lack T type lock pin; 21, lack T type lock pin return spring; 22, antifouling pin; 23, rocking arm; 24, cam; 25, oil duct; 26, oil trap; 27, oil duct; 28, T type pin head; 29, key; 30, pitman arm shaft center oilhole B;
Embodiment
Contrast accompanying drawing below, by description, the effect of the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, the each several part and annexation, each several part and working principle etc. are described in further detail embodiment:
As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, shown in Figure 8, the present invention is a kind of engine variable valve lift mechanism of realizing vat destruction function, comprise camshaft 4; pitman arm shaft 6, valve 9, valve spring 10; roller 14; rocking arm 23 comprise the different cam 24 of cam overhead height more than two on the return spring 11, described and the corresponding camshaft 1 in each firing chamber; The quantity of described rocking arm 23 is corresponding with the quantity of cam 24; Be provided with in the described pitman arm shaft 8 and different rocking arms 20 can be realized the T type pin 23 of the locking and unlocking effect, short T type lock pin 20 and oil duct 25, oil duct 27.
Described and the corresponding cam 24 in each firing chamber is set to three, and being divided into high rotating speed cam 1, slow-speed of revolution cam 3 and a lift is zero zero lift cam 2, and described high rotating speed cam 1 is set to the structure that the cam top curve is higher than slow-speed of revolution cam 11;
Described rocking arm 23 is set to two, is divided into first rocking arm 12, second Rocker arm 5 and the 3rd rocking arm 13, and described first rocking arm 12, second Rocker arm 5 and the 3rd rocking arm 13 contact with slow-speed of revolution cam 3, zero lift cam 2 and high rotating speed cam 1 by roller 14 respectively.
Described rocking arm 23 inside are provided with the circular hole that connects first rocking arm 12 and second Rocker arm 5, the circular hole installation that is positioned at first rocking arm, 12 1 ends sets out the oil duct 22 that extends first rocking arm 12 from T type pin 17 heads one end, on the pitman arm shaft 6 of oil duct 24 opposite positions on first rocking arm 12, be provided with along the oil trap 26 in 6 one weeks of pitman arm shaft; Described rocking arm 23 inside are provided with the circular hole that connects second Rocker arm 5 and the 3rd rocking arm 13, short T type lock pin 20 is installed in the circular hole, short T type lock pin 20 extends to the 3rd Rocker arm 5, the oil duct 27 of second Rocker arm 5 is extended in one end setting of second Rocker arm 5, on the corresponding pitman arm shaft 6 of the oil duct of second Rocker arm 5, be provided with along the oil trap 26 in 6 one weeks of pitman arm shaft.
Pocketed springs 18 on the described T type pin 17, spring 18 1 ends are resisted against T type pin head 28, and the other end is resisted against on the Roller Shaft 19, and T type pin 17 keeps not extending to the position in second rocking arm, 7 zones; One end of described short T type lock pin 20 is resisted against on the 3rd Rocker arm 5, and the other end and short T type lock pin are resisted against the short T type lock pin return spring 21 on the interior Roller Shaft 19 of second Rocker arm 5, and short T type lock pin 20 remains on the position of running through second Rocker arm 5 and the 3rd rocking arm 13.
The described oil trap 26 that connects with oil duct 25 connects with pitman arm shaft center oilhole A16, and pitman arm shaft center oilhole A (16) is connected with working connection, and the solenoid valve of control oil pressure is set between described pitman arm shaft center oilhole A16 and the working connection.
The described oil trap 26 that connects with oil duct 27 connects with pitman arm shaft center oilhole B30, and pitman arm shaft center oilhole B30 is connected with working connection, and the solenoid valve of control oil pressure is set between described pitman arm shaft center oilhole B30 and the working connection.
Described returning spring (11) guarantees that first rocking arm (5) and the 3rd rocking arm (13) fit tightly with cam (24) surface.
The present invention also relates to a kind of controlling method that realizes the variable air valve lift range mechanism of vat destruction function simultaneously, ECU waits the switching of control electromagnetic valve according to actual engine speed, load, thereby change the oil pressure of pitman arm shaft center oilhole A (16) by control electromagnetic valve, and then make T type pin (17) realize the switching of lock and unlock function, and, can make short T type lock pin (20) realize the lock and unlock functional movement by changing the oil pressure of pitman arm shaft center oilhole B (30).
A kind of controlling method of the variable air valve lift range mechanism of vat destruction function that realizes of the present invention is:
A) when parameters such as engine speed, load are lower than preset value, the solenoid valve of Control of Automobile engine variable valve lift mechanism oil circuit is in closed condition, and first rocking arm 12 and second Rocker arm 5 of described variable air valve stroke mechanism of car engine move independently of one another;
B) when parameters such as engine speed, load are higher than preset value, the solenoid valve of Control of Automobile engine variable valve lift mechanism oil circuit is opened, described variable air valve stroke mechanism of car engine solenoid valve is opened, and T type pin 17 locks together first rocking arm 12 and second Rocker arm 5;
C) when needs are closed certain or certain several cylinder, change the oil pressure of pitman arm shaft center oilhole B30 by the ECU control electromagnetic valve, promote short T type lock pin 20 and move to short T type lock pin return spring 21 1 ends.
Described motor is when the slow-speed of revolution, low-load, and T type lock pin 17 is in initial position, and described first rocking arm 12 and second Rocker arm 5 move independently of one another, and what determine the valve lift height this moment is slow-speed of revolution cam 3; When described motor car engine is in high rotating speed, high load, the solenoid valve of Control of Automobile engine variable valve lift mechanism oil circuit is opened; the oil pressure of pitman arm shaft center oilhole A16 raises; propagation of pressure is to T type pin 17 bottoms; machine oil promotes T type pin 17 and extends to second Rocker arm 5; first rocking arm 12 and the locking of second Rocker arm 5, and what determined valve lift this moment is high rotating speed cam 1; When described motor car engine is closed certain or certain several cylinder at needs, change the oil pressure of pitman arm shaft center oilhole B30 by the ECU control electromagnetic valve, promoting short T type lock pin 20 moves to short T type lock pin return spring 21 1 ends, thereby make first rocking arm 12, second Rocker arm 5 and 13 detaching motions of the 3rd rocking arm, what determine the valve lift height this moment is zero lift cam 2.
The default conditions of the air valve lift range mechanism of technical solution of the present invention are that the slow-speed of revolution cam 3 of the 3rd rocking arm 13 (slow-speed of revolution rocking arm) and correspondence thereof is related with valve 9, promptly under the engine start state, the initial valve lift of motor is low lift, this is in order to satisfy the warming-up needs of motor, so that each parts cylinder of motor is in good lubricated working state.
The default conditions of technical solution of the present invention have determined that the initial position of short T type lock pin between the 3rd rocking arm 13 and second Rocker arm 5 is that second Rocker arm 5 and the 3rd rocking arm 13 are in the lock position.And be in relatively independent state at original state first rocking arm 12 and second Rocker arm 5, this moment the T type lock pin 17 in second Rocker arm 5 initial position the time first rocking arm 12 relative free-moving position with second Rocker arm 5.
When control need separate second Rocker arm 5 with the 3rd rocking arm 13, solenoid valve is opened; the pressure among the oilhole B30 of pitman arm shaft center raises; machine oil will be lacked T type lock pin 20 pins by the short T type of 27 arrival of the oil duct in the oil trap 26 and second Rocker arm 5 lock pin 20 shaft shoulder portions and be pushed second Rocker arm 5; second Rocker arm 5 and the 3rd rocking arm 13 are removed locking, and under this state, second Rocker arm 5 also separates with first rocking arm 12; air valve lift range mechanism is in the zero lift state, as shown in Figure 5.
Described motor is when the slow-speed of revolution, low-load, and T type lock pin 17 is in initial position, and described first rocking arm 12 and second Rocker arm 5 move independently of one another, and what determine the valve lift height this moment is slow-speed of revolution cam 3, as shown in Figure 6;
When motor is at a high speed, loads greatly the output operating mode, native system switches to high valve lift by low valve lift, solenoid valve conversion opening; the pressure among the oilhole oil circuit A16 of pitman arm shaft center raises; oil circuit A communicates with oil duct 25 in second Rocker arm 5 by oil trap 16; the through T type lock pin of high-pressure oil bottom promotes T type lock pin and inserts in the locking hole of first rocking arm; T type lock pin 17 just circumferentially locks together first rocking arm 12 and second Rocker arm 5 along pitman arm shaft 6 at this moment; so high rotating speed cam 1 just is associated together with valve 9, as shown in Figure 7.The molded lines of high rotating speed cam 1 changes and just has been delivered to valve 9 places, and at this moment the lift of valve 9 is just according to the motion change of high rotating speed cam 1,
When motor is become the low-medium speed operating mode and is maybe needed to cut off this cylinder by high-speed working condition; the oil pressure among the oilhole A16 of pitman arm shaft center reduces; T type lock pin 17 bottoms have not just had oil pressure; under the effect of return spring; T type lock pin 17 is returned to its initial position; simultaneously first rocking arm 12 just and second Rocker arm 5 separate; high rotating speed cam 1 has just been removed related with valve 9; valve 9 is again according to the needs vanishing valve lift or the low lift state of control; and first rocking arm 12 (high rotating speed rocking arm) of this moment is making progress at the promotion lower swing of high speed rocker arm in the week of pitman arm shaft 6, but its motion can not be delivered to valve 9 places.
And when closing valve 9 according to the control needs, pressure raises among the oilhole B30 of pitman arm shaft center, the locking hole that short T type lock pin 20 is pushed away in the 3rd rocking arm 13, only have zero lift cam 2 to be associated with valve 9 this moment, as shown in Figure 5, valve is fully closed, if this cylinder inlet and outlet door is closed fully, this cylinder intake stops, fuel supply stops, and then this cylinder of motor has just stopped work, when control needs, native system switches the cam related with valve again, opens valve 9 again.
Can see by Fig. 8, be equipped with spiral spring at first rocking arm 12 and the 3rd rocking arm 13 both sides, spiral spring one end and rocking arm are fixed, the other end and pitman arm shaft 6 are fixing, this makes first rocking arm 12, the 3rd rocking arm 13 circumferentially can be close to the pairing cam face of two rocking arms in the swing along 6 of pitman arm shafts, avoid rocking arm to produce and beat, break away from cam face and cause the wearing and tearing of greater impact acceleration components.
Only enumerate every cylinder four air valve structure motors in the specific embodiment of the present invention; but the application area of present embodiment is not limited only to four air valve structure motors; for dual valve; or the mentality of designing that more valve present embodiments are embodied is suitable equally, therefore for above-mentioned application area equally at the protection domain of this patent.First rocking arm in the present embodiment is with directly related with two intake valves, but is not limited only to intake valve, and exhaust valve is suitable equally, because narration needs, only is example here with the intake valve.Be provided with two independent rocking arms in this example, and the high speed, the low speed rocker arm that are provided with high speed, two cams of low speed and cooperate with it, the binding engine operating mode needs control mechanism to control valve and open and close at zero lift, low lift, the middle selection of high lift three one.
The maximum characteristics of present embodiment are the setting of zero lift, it can realize the function of valve related with the zero lift cam in the shifter cylinder, being applied to each valve of motor just can be in engine working process, only needing artificial certain or certain the several cylinders cut off under the operating mode of low-power output, promptly realize " cylinder goes out " function, when present embodiment is applied in the multicylinder engine, needs according to different operating modes stop its supply of fuel in " cylinder goes out ", but the piston of this cylinder and spark plug proper functioning, only be supply and the power output that does not have fuel, at vehicle start, when quicken or climbing etc. needed high-power output, all cylinders were devoted oneself to work; When middling speed was cruised with engine low load, system is the machinery cylinder only, under high speed and high pulling torque work condition state, adopts full cylinder working, and cooperated big valve lift to reach peak output output.
Because " cylinder goes out " function and variable lift function that present embodiment is realized, make the motor of using this example that multiple different working staties combination be arranged, as partial cylinders-low valve lift, partial cylinders-high valve lift, full cylinder-low valve lift, full cylinder-high valve lift, this makes the maximum power output of using this example that bigger excursion arranged, control system is to the speed of vehicle, throttle opening, the speed of a motor vehicle, engine speed, the gearbox gear is selected and other factor is monitored, and enables and the valve lift selection scheme to determine suitable cylinder at various working staties.In addition, this example can determine also whether engine motor oil pressure is fit to native system and carries out the switching of mode of operation, and whether the temperature of catalytic converter still can remain in the proper range.For cylinder being enabled or transition when stopping using can steadily be carried out, system can adjust the aperture of ignition timing, closure etc., and correspondingly enables or remove native system.
In conjunction with the accompanying drawings the present invention has been carried out exemplary description above; obviously the concrete realization of the present invention is not subjected to the restriction of above-mentioned concrete mode; as long as the various improvement of having adopted method design of the present invention and technological scheme to carry out; or without change design of the present invention and technological scheme directly applied to other occasions, all fall within the scope of protection of the present invention.
Claims (10)
1. the engine variable valve lift mechanism that can realize vat destruction function, comprise camshaft (4); pitman arm shaft (6); valve (9); valve spring (10), returning spring (11), roller (14); rocking arm (23) is characterized in that: comprise the different cam (24) of cam overhead height more than two on described and the corresponding camshaft in each firing chamber (1); The quantity of described rocking arm (23) is corresponding with the quantity of cam (24); Be provided with in the described pitman arm shaft (8) and different rocking arms can be realized the T type pin (17) of the locking and unlocking effect, short T type lock pin (20) and oil duct (25), oil duct (27).
2. according to the described a kind of engine variable valve lift mechanism of realizing vat destruction function of claim 1, it is characterized in that: the described and corresponding cam in each firing chamber (24) is set to three, being divided into high rotating speed cam (1), slow-speed of revolution cam (3) and a lift is zero zero lift cam (2), and described high rotating speed cam (1) is set to the structure that the cam top curve is higher than slow-speed of revolution cam (11); Described rocking arm (23) is set to two, be divided into first rocking arm (12), second rocking arm (5) and the 3rd rocking arm (13), described first rocking arm (12), second rocking arm (5) and the 3rd rocking arm (13) contact with slow-speed of revolution cam (3), zero lift cam (2) and high rotating speed cam (2) by roller (14) respectively.
3. according to claim 1,2 described a kind of engine variable valve lift mechanisms of realizing vat destruction function, it is characterized in that: described rocking arm (23) inside is provided with the circular hole that connects first rocking arm (12) and second rocking arm (5), the circular hole installation that is positioned at first rocking arm (12) one ends sets out the oil duct (22) that extends first rocking arm (12) from T type pin (17) head one end, on the pitman arm shaft (6) of oil duct (24) opposite position on first rocking arm (12), be provided with along the pitman arm shaft oil trap in (6) one weeks (26); Described rocking arm (23) inside is provided with the circular hole that connects second rocking arm (5) and the 3rd rocking arm (13), short T type lock pin (20) is installed in the circular hole, short T type lock pin (20) extends to the 3rd rocking arm (5), the oil duct (27) of second rocking arm (5) is extended in one end setting of second rocking arm (5), on the corresponding pitman arm shaft of oil duct (6) of second rocking arm (5), be provided with along the pitman arm shaft oil trap in (6) one weeks (26).
4. according to the described a kind of engine variable valve lift mechanism of realizing vat destruction function of claim 1, it is characterized in that: described T type pin (17) is gone up pocketed springs (18), spring (18) one ends are resisted against T type pin head (28), the other end is resisted against on the Roller Shaft (19), and T type pin (17) keeps not extending to the position in second rocking arm (7) zone; One end of described short T type lock pin (20) is resisted against on the 3rd rocking arm (13), the other end and short T type lock pin are resisted against the short T type lock pin return spring (21) in the Roller Shaft (19) of interior second rocking arm (5), lack T type lock pin (20) and remain on the position of running through second rocking arm (5) and the 3rd rocking arm (13).
5. according to the described a kind of engine variable valve lift mechanism of realizing vat destruction function of claim 1, it is characterized in that: the described oil trap (26) that connects with oil duct (25) connects with pitman arm shaft center oilhole A (16); pitman arm shaft center oilhole A (16) is connected with working connection, and the solenoid valve of control oil pressure is set between described pitman arm shaft center oilhole A (16) and the working connection.
6. according to the described a kind of engine variable valve lift mechanism of realizing vat destruction function of claim 1, it is characterized in that: the described oil trap (26) that connects with oil duct (27) connects with pitman arm shaft center oilhole B (30); pitman arm shaft center oilhole B (30) is connected with working connection, and the solenoid valve of control oil pressure is set between described pitman arm shaft center oilhole B (30) and the working connection.
7. according to the described a kind of engine variable valve lift mechanism of realizing vat destruction function of claim 1, it is characterized in that: described returning spring (11) is a spiral spring, returning spring (11) one ends are fixed in pitman arm shaft (6), the other end is fixed on first rocking arm (12) or second rocking arm (5), in mechanism's working procedure, returning spring is given all the time with enough restoring forces and is made the rocking arm of winning (12), second rocking arm (5) fit in the cam face corresponding with it respectively.
8. controlling method that can realize the variable air valve lift range mechanism of vat destruction function, it is characterized in that: ECU waits the switching of control electromagnetic valve according to actual engine speed, load, thereby change the oil pressure of pitman arm shaft center oilhole A (16) by control electromagnetic valve, and then make T type pin (17) realize the switching of lock and unlock function, and, can make short T type lock pin (20) realize the lock and unlock functional movement by changing the oil pressure of pitman arm shaft center oilhole B (30).
9. according to the described a kind of controlling method that realizes the variable air valve lift range mechanism of vat destruction function of claim 8, it is characterized in that: described controlling method is:
A) when parameters such as engine speed, load are lower than preset value, the solenoid valve of Control of Automobile engine variable valve lift mechanism oil circuit is in closed condition, the motion independently of one another of first rocking arm (12) of described variable air valve stroke mechanism of car engine and second rocking arm (5);
B) when parameters such as engine speed, load are higher than preset value, the solenoid valve of Control of Automobile engine variable valve lift mechanism oil circuit is opened, described variable air valve stroke mechanism of car engine solenoid valve is opened, and T type pin (17) locks together first rocking arm (12) and second rocking arm (5);
C) when needs are closed certain or certain several cylinder, change the oil pressure of pitman arm shaft center oilhole B (30) by the ECU control electromagnetic valve, promote short T type lock pin (20) and move to short T type lock pin return spring (21) one ends.
10. 9 described a kind of controlling methods that realize the variable air valve lift range mechanism of vat destruction function according to Claim 8,, it is characterized in that: described motor is when the slow-speed of revolution, low-load, T type pin (17) is in initial position, the motion independently of one another of described first rocking arm (12) and second rocking arm (5), what determine the valve lift height this moment is slow-speed of revolution cam (3); When described motor car engine is in high rotating speed, high load, the solenoid valve of Control of Automobile engine variable valve lift mechanism oil circuit is opened; the oil pressure of pitman arm shaft center oilhole A (16) raises; propagation of pressure is to T type pin (17) bottom; machine oil promotes T type pin (17) and extends to second rocking arm (5); first rocking arm (12) and second rocking arm (5) locking, and what determined valve lift this moment is high rotating speed cam (1); When described motor car engine is closed certain or certain several cylinder at needs, change the oil pressure of pitman arm shaft center oilhole B (30) by the ECU control electromagnetic valve, promoting short T type lock pin (20) moves to short T type lock pin return spring (21) one ends, thereby make first rocking arm (12), second rocking arm (5) and the 3rd rocking arm (13) detaching motion, what determine the valve lift height this moment is zero lift cam (2), and valve (9) keeps closed condition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102121113A CN101368519B (en) | 2008-09-08 | 2008-09-08 | Engine variable valve lift mechanism capable of implementing vat destruction function and its control method |
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| CN2008102121113A CN101368519B (en) | 2008-09-08 | 2008-09-08 | Engine variable valve lift mechanism capable of implementing vat destruction function and its control method |
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| CN101368519A true CN101368519A (en) | 2009-02-18 |
| CN101368519B CN101368519B (en) | 2010-12-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925032A (en) * | 2013-01-15 | 2014-07-16 | 长城汽车股份有限公司 | Variable valve lift driving device |
| CN109312646A (en) * | 2016-04-28 | 2019-02-05 | 斯堪尼亚商用车有限公司 | A kind of valve actuation part |
| CN110836143A (en) * | 2018-08-16 | 2020-02-25 | 上海汽车集团股份有限公司 | Method and system for judging variable valve lift switching |
-
2008
- 2008-09-08 CN CN2008102121113A patent/CN101368519B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925032A (en) * | 2013-01-15 | 2014-07-16 | 长城汽车股份有限公司 | Variable valve lift driving device |
| CN103925032B (en) * | 2013-01-15 | 2016-08-03 | 长城汽车股份有限公司 | A kind of variable valve lift driving device |
| CN109312646A (en) * | 2016-04-28 | 2019-02-05 | 斯堪尼亚商用车有限公司 | A kind of valve actuation part |
| CN110836143A (en) * | 2018-08-16 | 2020-02-25 | 上海汽车集团股份有限公司 | Method and system for judging variable valve lift switching |
| CN110836143B (en) * | 2018-08-16 | 2021-07-27 | 上海汽车集团股份有限公司 | Method and system for judging variable valve lift switching |
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| Publication number | Publication date |
|---|---|
| CN101368519B (en) | 2010-12-15 |
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