CN102705031A - Stepless variable lift system of engine - Google Patents
Stepless variable lift system of engine Download PDFInfo
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- CN102705031A CN102705031A CN2012102053610A CN201210205361A CN102705031A CN 102705031 A CN102705031 A CN 102705031A CN 2012102053610 A CN2012102053610 A CN 2012102053610A CN 201210205361 A CN201210205361 A CN 201210205361A CN 102705031 A CN102705031 A CN 102705031A
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- cylinder
- motor
- stepless variable
- valve
- variable valve
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention discloses a stepless variable lift system of an engine. The stepless variable lift system comprises a cylinder assembly used for opening and closing a valve; a camshaft used for pushing the cylinder assembly; and an electronic control unit used for controlling air pressure in the cylinder of the cylinder assembly according to a work condition signal of the engine, controlling the extension length of a piston of the cylinder assembly through controlling the air pressure in the cylinder, and controlling the opening degree of the valve through controlling the extension length of the piston. According to the invention, the stepless regulation of the valve of the engine is realized, so that the air intake is matched with the work condition of the engine well.
Description
Technical field
The present invention relates to the car engine machine technology, particularly relate to a kind of motor stepless variable valve lift system.
Background technique
The effect of the valve of motor is to be responsible for input fuel and combustion gas in motor specially; Valve is driven by camshaft; The inlet and outlet door time that opens and closes is all fixed, and is difficult to this changeless valve timing with respect to the air inflow needs of motor when different rotating speeds and the operating mode.
On the present motor; VVT has become the standard configuration of motor; VVT installs a cover hydrodynamic body additional through the driving end at camshaft; Thereby realize camshaft angle adjustment within the specific limits, be equivalent to the opening and closing of valve are regulated constantly.And VVT is just controlled on the time of valve opening, still can't be implemented in the control on the air inflow.
Existing manufacturer with the lift range variable technical application to motor; Technology called after i-vtec (Variable Valve Timing and Lift Electronic Control; The intelligent alterable valve timing system); This system architecture and working principle are also uncomplicated, and it utilizes the 3rd rocking arm and the 3rd the valve lift variation that the camshaft machine has been realized seeming complicated, belongs to two-part and regulates.
Therefore; Existing lift range variable technology generally all is that segmented is regulated valve lift, and air input of engine by air also can change air inflow because of sectional-regulated difference, though this valve adjustments mode improves engine efficiency; But can only satisfy the air inflow under the some operating modes of motor; Can't satisfy the air inflow of needs under the various operating modes of motor,, make that the output of motor is linear inadequately owing to do not realize step-less adjustment.
Summary of the invention
The purpose of the embodiment of the invention provides a kind of motor stepless variable valve lift system, can realize the step-less adjustment of engine valve, make air inflow can be better and the working condition of motor be complementary.
To achieve these goals, the invention provides a kind of motor stepless variable valve lift system, comprising:
Cylinder assembly is used for the opening and closing valve;
Camshaft, be used to promote said cylinder assembly;
Electronic control unit; Be used for: according to the cylinder internal air pressure of the said cylinder assembly of motor worker shape SC sigmal control; Control the piston extrusion of said cylinder assembly through controlling said cylinder internal air pressure, control the opening degree of said valve through controlling said piston extrusion.
Preferably, in the above-mentioned motor stepless variable valve lift system, said cylinder assembly comprises:
Cylinder body;
Piston is positioned at said cylinder body, and said cylinder body is divided into epicoele and cavity of resorption;
Push rod, an end connects said piston from said cavity of resorption, and the other end stretches out and connects said valve outside the said cylinder body;
Solenoid valve is used for: according to opening or close the suction port of said epicoele from the control signal of said electronic control unit, thereby control the said cylinder internal air pressure of said epicoele.
Preferably, in the above-mentioned motor stepless variable valve lift system, also comprise:
Compressor connects the suction port of said epicoele, is used for to said epicoele pressurized air being provided.
Preferably, in the above-mentioned motor stepless variable valve lift system, said solenoid valve is positioned at the upper end of said cylinder body.And contact with said camshaft.
Preferably, in the above-mentioned motor stepless variable valve lift system, said electronic control unit also is used for:
If said motor worker shape signal is that idling or rotating speed are lower than first threshold value, in two intake valves of the cylinder that then kills engine one.
Preferably, in the above-mentioned motor stepless variable valve lift system, said electronic control unit also is used for:
If said motor worker shape signal is an acceleration to be surpassed second threshold value or rotating speed and surpass the 3rd threshold value, said two intake valves are opened simultaneously with same maximum lift.
Preferably, in the above-mentioned motor stepless variable valve lift system, said electronic control unit also is used for:
Close said two intake valves simultaneously, realize the cylinder deactivation function.
There is following technique effect at least in the embodiment of the invention:
1) the present invention controls the opening degree of valve through cylinder assembly, because the extrusion of the piston of cylinder assembly can linearity control, so the embodiment of the invention can realize the step-less adjustment of engine valve;
2) valve opening degree of the present invention is confirmed according to motor worker shape signal, so that air inflow can be better and the working condition of motor be complementary.
3)) the present invention also confirms the unlatching strategy of 2 valves according to motor worker shape signal, makes motor be in optimal combustion state constantly, has improved Economy, can also realize the cylinder deactivation function.
Description of drawings
The structural drawing of the motor stepless variable valve lift system that Fig. 1 provides for the embodiment of the invention;
The control principle figure of the motor stepless variable valve lift system that Fig. 2 provides for the embodiment of the invention.
Embodiment
For the purpose, technological scheme and the advantage that make the embodiment of the invention is clearer, will combine accompanying drawing that specific embodiment is described in detail below.
The structural drawing of the motor stepless variable valve lift system that Fig. 1 provides for the embodiment of the invention, as shown in Figure 1, the embodiment of the invention provides a kind of motor stepless variable valve lift system, comprising:
Camshaft 120, be used to promote said cylinder assembly;
It is thus clear that; The present invention controls the opening degree of said valve through cylinder assembly 110; Because the extrusion of the piston of cylinder assembly can linearity control; So the embodiment of the invention can realize the step-less adjustment of engine valve, the valve opening degree confirms according to motor worker shape signal, so that air inflow can be better and the working condition of motor be complementary.
In a preferred embodiment of the present invention, said cylinder assembly 110 comprises:
Cylinder body 111;
Piston 112 is positioned at said cylinder body, and said cylinder body is divided into epicoele and cavity of resorption;
Also comprise: compressor, connect the suction port of said epicoele, be used for pressurized air being provided to said epicoele.
As shown in Figure 1, in a preferred embodiment of the present invention, said solenoid valve 114 is positioned at the upper end of said cylinder body 111.And contact with said camshaft 120.
Said electronic control unit also is used for:
If said motor worker shape signal is that idling or rotating speed are lower than first threshold value, in two intake valves of the cylinder that then kills engine one.
If said motor worker shape signal is an acceleration to be surpassed second threshold value or rotating speed and surpass the 3rd threshold value, said two intake valves are opened simultaneously with same maximum lift.
Close said two intake valves simultaneously, realize the cylinder deactivation function.
The control principle figure of the motor stepless variable valve lift system that Fig. 2 provides for the embodiment of the invention.
ECU (Electronic Control Unit, electronic control unit) provides " control switch " signal to solenoid valve, comes the opening degree of control electromagnetic valve; Compressor provides pressure to solenoid valve, makes pressurized air get into the cylinder assembly as air valve lift range mechanism through solenoid valve, thus the opening degree of control valve.
Thus it is clear that,, the invention provides a kind of motor stepless variable lift system with respect to the lift range variable technology that existing segmented is regulated.
The present invention makes motor that higher inlet and outlet efficient arranged under various operating modes and rotating speed, when promoting power, further reduces the oil consumption level.The present invention is through to the step-less adjustment of valve lift, can make vehicle have best power source to mate and Economy down at various operating modes and load according to the oil inlet quantity of the different timely adjustment motors of operating mode.
When idling or the low speed driving, can realize an intake valve killing engine, like vehicle owing to have only an intake valve job; Inhaled air can not pass through the cylinder center, in cylinder, can produce strong intake swirl, thereby can increase rate of burning; Make burning more abundant, improved Economy.
Quickening or high rotating speed when going, two intake valves are opened like vehicle simultaneously with same maximum lift, intake efficiency at this moment can significantly improve, and makes motor that sufficient power can be arranged when high rotation speed operation.
Except that above special operation condition, also can adjust the most reasonably valve lift according to the working condition signal that Engine ECU transmits in good time, cooperate the engine variable timing system, make motor be in optimal combustion state constantly.
When not needing big discharge capacity, two intake valves of the same cylinder of may command are all closed, and realize the cylinder deactivation function.
The working principle of the embodiment of the invention is following:
Motor stepless variable valve lift system.Camshaft 120 belows are solenoid valves 114; Camshaft 120 can drive solenoid valve 114 and move downward; Solenoid valve 114 and cylinder body 111, piston 112 and variable lift mechanisms of push rod 113 common formations are through the function of solenoid valve 114 control cylinder internal pressures realization variable lift.
During engine operation, to solenoid valve 114 air pressure is provided by compressor, the switch of Engine ECU control electromagnetic valve 114 is by the pressure in solenoid valve 114 control cylinders.When not needing IO Intake Valve Opens, ECU control electromagnetic valve 114, the inlet close of solenoid valve 114; The exhaust open of while solenoid valve 114; Make the cylinder internal air pressure equal barometric pressure, solenoid valve 114 moves downward with cylinder body 111, and piston 112 does not move; Do not promote push rod 113, intake valve is in closed condition always.When the needs IO Intake Valve Opens, the air inlet open of ECU control electromagnetic valve 114, the exhaust close of solenoid valve 114 simultaneously; Compressor provides certain pressure in cylinder, camshaft 120 drives solenoid valve 114 and moves downward jointly with cylinder body 111, the compression gas in the jar; When the pressure of gas in the jar during greater than the transition point of the deformation of valve spring; Piston 112 meetings and cylinder body 111 move downward jointly, promote push rod 113, thereby promote valve opening.The amplitude of valve opening depends on the gas pressure size in the cylinder fully like this, and the big I of pressure is suitably regulated by ECU and solenoid valve, thereby passes through the different pressures of solenoid valve 114 control gas in the jar, can realize the electrodeless adjusting to valve lift.
By on can know that the embodiment of the invention has following advantage:
1) the present invention controls the opening degree of valve through cylinder assembly, because the extrusion of the piston of cylinder assembly can linearity control, so the embodiment of the invention can realize the step-less adjustment of engine valve;
2) valve opening degree of the present invention is confirmed according to motor worker shape signal, so that air inflow can be better and the working condition of motor be complementary.
3)) the present invention also confirms the unlatching strategy of 2 valves according to motor worker shape signal, makes motor be in optimal combustion state constantly, has improved Economy, can also realize the cylinder deactivation function.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (7)
1. a motor stepless variable valve lift system is characterized in that, comprising:
Cylinder assembly is used for the opening and closing valve;
Camshaft, be used to promote said cylinder assembly;
Electronic control unit; Be used for: according to the cylinder internal air pressure of the said cylinder assembly of motor worker shape SC sigmal control; Control the piston extrusion of said cylinder assembly through controlling said cylinder internal air pressure, control the opening degree of said valve through controlling said piston extrusion.
2. motor stepless variable valve lift according to claim 1 system is characterized in that said cylinder assembly comprises:
Cylinder body;
Piston is positioned at said cylinder body, and said cylinder body is divided into epicoele and cavity of resorption;
Push rod, an end connects said piston from said cavity of resorption, and the other end stretches out and connects said valve outside the said cylinder body;
Solenoid valve is used for: according to opening or close the suction port of said epicoele from the control signal of said electronic control unit, thereby control the said cylinder internal air pressure of said epicoele.
3. motor stepless variable valve lift according to claim 1 system is characterized in that, also comprises:
Compressor connects the suction port of said epicoele, is used for to said epicoele pressurized air being provided.
4. motor stepless variable valve lift according to claim 2 system is characterized in that said solenoid valve is positioned at the upper end of said cylinder body.And contact with said camshaft.
5. motor stepless variable valve lift according to claim 1 system is characterized in that said electronic control unit also is used for:
If said motor worker shape signal is that idling or rotating speed are lower than first threshold value, in two intake valves of the cylinder that then kills engine one.
6. motor stepless variable valve lift according to claim 5 system is characterized in that said electronic control unit also is used for:
If said motor worker shape signal is an acceleration to be surpassed second threshold value or rotating speed and surpass the 3rd threshold value, said two intake valves are opened simultaneously with same maximum lift.
7. motor stepless variable valve lift according to claim 6 system is characterized in that said electronic control unit also is used for:
Close said two intake valves simultaneously, realize the cylinder deactivation function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102053610A CN102705031A (en) | 2012-06-20 | 2012-06-20 | Stepless variable lift system of engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102053610A CN102705031A (en) | 2012-06-20 | 2012-06-20 | Stepless variable lift system of engine |
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| CN102705031A true CN102705031A (en) | 2012-10-03 |
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| CN2012102053610A Pending CN102705031A (en) | 2012-06-20 | 2012-06-20 | Stepless variable lift system of engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106996337A (en) * | 2016-01-25 | 2017-08-01 | 牛刚学 | The stability solution of internal combustion engine cylinder deactivation oil-break |
| CN107288699A (en) * | 2016-04-11 | 2017-10-24 | 浙江师范大学 | A kind of Piezoelectric Driving without camshaft valve actuating mechanism |
| ES2954608A1 (en) * | 2022-04-14 | 2023-11-23 | De Castro De La Fuente Jose Luis Bermudez | DUAL VALVE DRIVING METHOD AND VALVE DRIVING SYSTEM WHERE IT IS APPLIED (Machine-translation by Google Translate, not legally binding) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4696265A (en) * | 1984-12-27 | 1987-09-29 | Toyota Jidosha Kabushiki Kaisha | Device for varying a valve timing and lift for an internal combustion engine |
| JPH0357805A (en) * | 1989-07-26 | 1991-03-13 | Fuji Heavy Ind Ltd | Variable valve timing device |
| US6067946A (en) * | 1996-12-16 | 2000-05-30 | Cummins Engine Company, Inc. | Dual-pressure hydraulic valve-actuation system |
| CN1959072A (en) * | 2006-11-13 | 2007-05-09 | 济南轻骑摩托车股份有限公司 | Electrohydraulic controlled continuously variable gas distribution timing system in internal-combustion engine |
| CN102383892A (en) * | 2011-09-28 | 2012-03-21 | 上海交通大学 | Variable air valve lift mechanism of internal combustion engine |
-
2012
- 2012-06-20 CN CN2012102053610A patent/CN102705031A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4696265A (en) * | 1984-12-27 | 1987-09-29 | Toyota Jidosha Kabushiki Kaisha | Device for varying a valve timing and lift for an internal combustion engine |
| JPH0357805A (en) * | 1989-07-26 | 1991-03-13 | Fuji Heavy Ind Ltd | Variable valve timing device |
| US6067946A (en) * | 1996-12-16 | 2000-05-30 | Cummins Engine Company, Inc. | Dual-pressure hydraulic valve-actuation system |
| CN1959072A (en) * | 2006-11-13 | 2007-05-09 | 济南轻骑摩托车股份有限公司 | Electrohydraulic controlled continuously variable gas distribution timing system in internal-combustion engine |
| CN102383892A (en) * | 2011-09-28 | 2012-03-21 | 上海交通大学 | Variable air valve lift mechanism of internal combustion engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106996337A (en) * | 2016-01-25 | 2017-08-01 | 牛刚学 | The stability solution of internal combustion engine cylinder deactivation oil-break |
| CN107288699A (en) * | 2016-04-11 | 2017-10-24 | 浙江师范大学 | A kind of Piezoelectric Driving without camshaft valve actuating mechanism |
| ES2954608A1 (en) * | 2022-04-14 | 2023-11-23 | De Castro De La Fuente Jose Luis Bermudez | DUAL VALVE DRIVING METHOD AND VALVE DRIVING SYSTEM WHERE IT IS APPLIED (Machine-translation by Google Translate, not legally binding) |
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Application publication date: 20121003 |