CN101699040B - Two-stage variable compression ratio system of gasoline engine and control method thereof - Google Patents
Two-stage variable compression ratio system of gasoline engine and control method thereof Download PDFInfo
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- CN101699040B CN101699040B CN2009102365644A CN200910236564A CN101699040B CN 101699040 B CN101699040 B CN 101699040B CN 2009102365644 A CN2009102365644 A CN 2009102365644A CN 200910236564 A CN200910236564 A CN 200910236564A CN 101699040 B CN101699040 B CN 101699040B
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Abstract
The invention relates to a two-stage variable compression ratio system of a gasoline engine and a control method thereof. On two overhead camshafts corresponding to an intake valve and an exhaust valve of the engine, a big cam and a small cam, which correspond to the intake valve and the exhaust valve of each cylinder are respectively arranged; an intake valve cam profile switching mechanism is arranged on the intake valve of each cylinder and is used for switching the big cam and the small cam of the intake valve, which correspond to the intake valve; and an exhaust valve cam profile switching mechanism is arranged on the exhaust valve of each cylinder and is used for switching the big cam and the small cam of the exhaust valve, which correspond to the exhaust valve. The system and the method have the advantages of quickly changing the compression ratio, realizing the switching between SI and HCCI combustion modes in an engine cycle, obtaining low oil consumption by adopting a high compression ratio when the engine has a medium or low load, and obtaining a high-power density by adopting a low compression ratio to avoid detonation when the engine has a high load.
Description
Technical field
The present invention relates to technical field of internal combustion engines; Be particularly related to the petrol engine that adopts the HCCI/SI mixed combustion mode; Be to adopt homogeneous charge compression ignition burning (HCCI) pattern of high compression ratio to realize high-efficiency low-pollution under the medium and small load; Adopt spark ignition (SI) combustion mode of low compression ratio during big the load, obtain high specific power and pinking does not take place.
Background technique
The medium and small load oil consumption of petrol engine is high, exceeds 20%～30% than diesel engine; And easy pinking when big load has limited power output.In order to solve the problem of the medium and small load oil consumption of petrol engine difference, need to improve compression ratio; And to solve the problem of the easy pinking of the big load of petrol engine, need to reduce compression ratio.Therefore, optimal method is an alterable compression ratio, and this can make the oil consumption of petrol engine and power output improve significantly, and can reduce noise and vibration.
Saab motor corporation utilized the VCR technology of its exploitation on a natural aspiration multicylinder engine, to study compression ratio and intake temperature influence [the Haraldsson G to the HCCI burning in 2002; Et al.HCCI combustin phasing in a multi cylinder engine using variable compression ratio.SAE 2002-01-2858]; Find that high compression ratio can replace the air inlet heating to realize HCCI; But the VCR complex structure is difficult to industrialization.The piston crank mechanism that a kind of alterable compression ratio was invented in 2006 by Nissan, ε=14 when middle-low load is worked can significantly improve the thermal efficiency and can detonation; [the M.Sekine of high load when work ε=8.; Year book-Gasoline Engine, Journal of JSAE, Vol.61; No.8,2007].But the method for continuous variable compression ratio is also impracticable for vehicular engine at present, and cost is too high, has increased the vehicular engine control system again and has optimized complexity.
Summary of the invention
The object of the invention just is to provide a kind of two-stage variable compression ratio system of gasoline engine and controlling method thereof, to solve above-mentioned defective of the prior art.
For realizing above-mentioned purpose, technological scheme of the present invention is to adopt a kind of two-stage variable compression ratio system of gasoline engine, and on two overhead camshafts of corresponding engine intake valve and exhaust valve, the intake valve of corresponding every cylinder and exhaust valve are provided with big cam and little cam respectively; Inlet valve cam molded lines switching mechanism is set, to be used to switch intake valve big cam corresponding and the little cam of intake valve with this intake valve on the intake valve of every cylinder; Exhaust valve cam molded lines switching mechanism is set, to be used to switch exhaust valve big cam corresponding and the little cam of exhaust valve with this exhaust valve on the exhaust valve of every cylinder.
Wherein, the IC Intake Valve Closes angle of said intake valve big cam is made as 60 ℃ of A ABDC～90 ℃ A ABDC; The IC Intake Valve Closes angle of the little cam of said intake valve is made as-10 ℃ of AABDC～20 ℃ A ABDC; The IO Intake Valve Opens angle of the little cam of said intake valve is made as 80 ℃ of A ATDC～0 ℃ A ATDC; The exhaust valve closing angle of the little cam of said exhaust valve is made as-80 ℃ of A ATDC～0 ℃ A ATDC.
Wherein,, control said inlet valve cam molded lines switching mechanism cam profile is switched to the little cam of intake valve, and control said exhaust valve cam molded lines switching mechanism cam profile is switched to the little cam of exhaust valve when the load of motor during less than predefined value A; When the load of motor during, control said inlet valve cam molded lines switching mechanism cam profile is switched to the intake valve big cam, and control said exhaust valve cam molded lines switching mechanism cam profile is switched to the exhaust valve big cam greater than predefined value A.
Wherein, when the load of motor is lower than predefined value B less than predefined value A and coolant water temperature, adopt spark-ignition combustion mode; When the load of motor is higher than predefined value B less than predefined value A and coolant water temperature, adopt homogeneous charge compression ignition combustion pattern; When the load of motor during, adopt spark-ignition combustion mode greater than predefined value A.
Wherein, said predefined value A is 0.4MPa～0.5MPa.
Wherein, said predefined value B is 80 ℃～90 ℃.
The present invention also provides a kind of controlling method of system as stated, and this method comprises:
The payload of S1, detection of engine;
S2, when said load during less than predefined value A; The inlet valve cam molded lines switching mechanism of control setting on the intake valve of every cylinder; Cam profile is switched to the little cam of the intake valve corresponding with this intake valve; And the exhaust valve cam molded lines switching mechanism of control setting on the exhaust valve of every cylinder switches to the little cam of the exhaust valve corresponding with this exhaust valve with cam profile;
When said load during greater than predefined value A; The inlet valve cam molded lines switching mechanism that on the intake valve of every cylinder, is provided with; Cam profile is switched to the intake valve big cam corresponding with this intake valve; And the exhaust valve cam molded lines switching mechanism that on the exhaust valve of every cylinder, is provided with switches to the exhaust valve big cam corresponding with this exhaust valve with cam profile.
Wherein, said controlling method also comprises: S3, utilize three-way catalyst that tail gas is handled.
Wherein, said predefined value A is 0.4Mpa～0.5MPa.
Advantage of the present invention and beneficial effect are, can realize the quick change of compression ratio; Can in an engine cycles, realize switching between SI and HCCI combustion mode; During the medium and small load of motor, adopt higher compression ratios to obtain low oil consumption; During the big load of motor, adopt and avoid pinking, obtain high power density than low compression ratio.
Description of drawings
Fig. 1 is the schematic representation of the combustion system of the related two-stage variable compression ratio system of gasoline engine of embodiments of the invention;
Fig. 2 is four kinds of cam lifting curve schematic representation of the related two-stage variable compression ratio system of gasoline engine of embodiments of the invention;
Fig. 3 is the port timing schematic representation under the related high compression ratio HCCI combustion mode of embodiments of the invention;
Fig. 4 is the port timing schematic representation under the related low compression ratio SI combustion mode of embodiments of the invention;
Fig. 5 is the flow chart of the controlling method of the related two-stage variable compression ratio system of gasoline engine of embodiments of the invention.
Among the figure: 1, spark plug; 2, oil sprayer; 10, intake valve; 11, inlet valve cam molded lines switching mechanism; 12, the little cam of intake valve; 13, intake valve big cam; 20, exhaust valve; 21, exhaust valve cam molded lines switching mechanism; 22, the little cam of exhaust valve; 23, exhaust valve big cam.
Embodiment
Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
The two-stage variable compression ratio system of gasoline engine of present embodiment, as shown in Figure 1, on two overhead camshafts of corresponding engine intake valve and exhaust valve, the intake valve 10 and the exhaust valve 20 of corresponding every cylinder are provided with big cam and little cam respectively; Inlet valve cam molded lines switching mechanism 11 is set, to be used to switch the intake valve big cam 13 and intake valve little cam 12 corresponding with this intake valve 10 on the intake valve 10 of every cylinder; Exhaust valve cam molded lines switching mechanism 21 is set, to be used to switch the exhaust valve big cam 23 and exhaust valve little cam 22 corresponding with this exhaust valve 20 on the exhaust valve 20 of every cylinder.Fig. 2 is above-mentioned four kinds of cam lifting curve schematic representation.
The geometrical compression ratio of petrol engine of the present invention is made as 13～15, and the IC Intake Valve Closes angle (IVC) of intake valve big cam 13 is made as 60 ℃ of A ABDC～90 ℃ A ABDC; The IC Intake Valve Closes angle (IVC) of the little cam 12 of intake valve is made as-10 ℃ of A ABDC～20 ℃ A ABDC; The IO Intake Valve Opens angle (IVO) of the little cam 12 of intake valve is made as 80 ℃ of A ATDC～0 ℃ AATDC; The exhaust valve closing angle (EVC) of the little cam 22 of exhaust valve is made as-80 ℃ of AATDC～0 ℃ A ATDC.
When the load of motor during less than predefined value A; Said inlet valve cam molded lines switching mechanism switches to the little cam of intake valve with cam profile; And said exhaust valve cam molded lines switching mechanism switches to the little cam of exhaust valve with cam profile, promptly switches to the high compression ratio mode of operation.When the load of motor during greater than predefined value A; Said inlet valve cam molded lines switching mechanism switches to the intake valve big cam with cam profile; And said exhaust valve cam molded lines switching mechanism switches to the exhaust valve big cam with cam profile, promptly switches to the low compression ratio mode of operation.
And, when the load of motor is lower than predefined value B less than predefined value A and coolant water temperature, adopt spark-ignition combustion mode (SI); When the load of motor is higher than predefined value B greater than predefined value A and coolant water temperature, adopt homogeneous charge compression ignition combustion pattern (HCCI); When the load of motor during, adopt spark-ignition combustion mode (SI) greater than predefined value A.
In above-mentioned, the span of predefined value A is 0.4MPa～0.5MPa preferably.
In above-mentioned, preferably 80 ℃～90 ℃ of the spans of predefined value B.
With specific embodiment two-stage variable compression ratio system of gasoline engine of the present invention and controlling method thereof are described below.
In the present embodiment, the engines distribution phase place is designed to as shown in table 1.
Table 1
| The air inlet big cam | The little cam of air inlet | The exhaust big cam | The little cam of exhaust | |
| EVO/℃A?ABDC | -55 | -45 | ||
| EVC/℃A?ATDC | 20 | -65 | ||
| IVO/℃A?ATDC | -20 | 30 | ||
| IVC/℃A?ABDC | 70 | 0 | ||
| Cam maximum lift/mm | 9.0 | 4.0 | 8.6 | 4.0 |
As shown in Figure 5, the controlling method of the two-stage variable compression ratio system of gasoline engine of present embodiment comprises the steps.
The payload of S1, detection of engine is also judged.
S2, when said load during less than the 0.4MPa mean effective pressure; The inlet valve cam molded lines switching mechanism 11 of control setting on the intake valve 10 of every cylinder; Cam profile is switched to the intake valve little cam 12 corresponding with this intake valve 10; And the exhaust valve cam molded lines switching mechanism 21 of control setting on the exhaust valve 20 of every cylinder switches to the exhaust valve little cam 22 corresponding with this exhaust valve 20 with cam profile, promptly switches to high compression ratio control mode shown in Figure 3; When said load during greater than the 0.4MPa mean effective pressure; The inlet valve cam molded lines switching mechanism 11 of control setting on the intake valve 10 of every cylinder; Cam profile is switched to the intake valve big cam 13 corresponding with this intake valve 10; And the exhaust valve cam molded lines switching mechanism 21 of control setting on the exhaust valve 20 of every cylinder; Cam profile is switched to the exhaust valve big cam 23 corresponding with this exhaust valve 20, promptly switch to low compression ratio control mode shown in Figure 4, adopt spark-ignition combustion mode (SI) this moment.When petrol engine is operated in the low compression ratio pattern, judge the temperature of cooling water, when the temperature of cooling water is lower than 85 ℃, adopt spark-ignition combustion mode (SI); When the temperature of cooling water is higher than certain value, adopt homogeneous charge compression ignition combustion pattern (HCCI).
S3, utilize three-way catalyst that tail gas is handled.
Promptly; When engine load is higher than 85 ℃ less than the temperature of 0.4MPa mean effective pressure and cooling water; Adopt thin HCCI burning, utilize three-way catalysts oxidize HC and CO discharging, when the temperature greater than 0.4MPa mean effective pressure or cooling water of loading is lower than 85 ℃; Adopt equivalent proportion SI burning, to noxious emission---HC, CO, NOx be catalytic purification simultaneously.
Present embodiment utilizes the cam profile switching mechanism to realize that thereby the quick variation of port timing reaches the purpose that realizes two-stage variable actual compression ratio (as 9 and 13), satisfies the requirement of the switching of petrol engine SI and HCCI combustion mode.Because the particular design of port timing has realized under the medium and small load that raising compression ratio and minimizing pumping loss obtain remarkable oil-saving effect, reduce compression ratio when loading greatly simultaneously, avoided petrol engine to adopt the pinking of SI burning.In addition, adopt intake valve to close when reducing effective compression ratio inhibition SI combustion knock the also corresponding reduction of volumetric efficiency evening.Specific power when loading for guaranteeing that motor is big, air input of engine by air compensates through supercharging.
And, when the little load of motor and coolant water temperature are low, realize the equivalent proportion mixed gas SI burner operation mode under the high compression ratio through closure control air inflow, three-way catalyst carries out catalytic purification simultaneously to NOx, HC and CO; When the medium and small load of motor and coolant water temperature were higher, WOT was realized the weak mixture HCCI burner operation mode under the high compression ratio.NOx discharging extremely low (less than 10ppm) under this mode of operation mainly produces HC and CO discharging, and three-way catalyst only needs HC and CO discharging are carried out oxidation processes.During big the load, adopt the SI burner operation mode under the low compression ratio, three-way catalyst carries out catalytic purification simultaneously to NOx, HC and CO.
More than be preferred forms of the present invention, according to content disclosed by the invention, those of ordinary skill in the art can obviously expect some identical, replacement schemes, and these schemes all should fall into the scope of the present invention's protection.
Claims (8)
1. a two-stage variable compression ratio system of gasoline engine is characterized in that,
On two overhead camshafts of corresponding engine intake valve and exhaust valve, the intake valve of corresponding every cylinder and exhaust valve are provided with big cam and little cam respectively;
Inlet valve cam molded lines switching mechanism is set, to be used to switch intake valve big cam corresponding and the little cam of intake valve with this intake valve on the intake valve of every cylinder;
Exhaust valve cam molded lines switching mechanism is set, to be used to switch exhaust valve big cam corresponding and the little cam of exhaust valve with this exhaust valve on the exhaust valve of every cylinder;
When the load of motor during, control said inlet valve cam molded lines switching mechanism cam profile is switched to the little cam of intake valve, and control said exhaust valve cam molded lines switching mechanism cam profile is switched to the little cam of exhaust valve less than predefined value A;
When the load of motor during, control said inlet valve cam molded lines switching mechanism cam profile is switched to the intake valve big cam, and control said exhaust valve cam molded lines switching mechanism cam profile is switched to the exhaust valve big cam greater than predefined value A.
2. two-stage variable compression ratio system of gasoline engine as claimed in claim 1 is characterized in that,
The IC Intake Valve Closes angle of said intake valve big cam is made as 60 ℃ of A ABDC～90 ℃ AABDC;
The IC Intake Valve Closes angle of the little cam of said intake valve is made as-10 ℃ of A ABDC～20 ℃ A ABDC;
The IO Intake Valve Opens angle of the little cam of said intake valve is made as 80 ℃ of A ATDC～0 ℃ AATDC;
The exhaust valve closing angle of the little cam of said exhaust valve is made as-80 ℃ of A ATDC～0 ℃ A ATDC.
3. two-stage variable compression ratio system of gasoline engine as claimed in claim 1 is characterized in that,
When the load of motor is lower than predefined value B less than predefined value A and coolant water temperature, adopt spark-ignition combustion mode;
When the load of motor is higher than predefined value B less than predefined value A and coolant water temperature, adopt homogeneous charge compression ignition combustion pattern;
When the load of motor during, adopt spark-ignition combustion mode greater than predefined value A.
4. like claim 1 or 3 described two-stage variable compression ratio system of gasoline engine, it is characterized in that said predefined value A is 0.4MPa～0.5MPa.
5. two-stage variable compression ratio system of gasoline engine as claimed in claim 3 is characterized in that, said predefined value B is 80 ℃～90 ℃.
6. controlling method of system according to claim 1 is characterized in that this method comprises:
The payload of S1, detection of engine;
S2, when said load during less than predefined value A; The inlet valve cam molded lines switching mechanism of control setting on the intake valve of every cylinder; Cam profile is switched to the little cam of the intake valve corresponding with this intake valve; And the exhaust valve cam molded lines switching mechanism of control setting on the exhaust valve of every cylinder switches to the little cam of the exhaust valve corresponding with this exhaust valve with cam profile;
When said load during greater than predefined value A; The inlet valve cam molded lines switching mechanism that on the intake valve of every cylinder, is provided with; Cam profile is switched to the intake valve big cam corresponding with this intake valve; And the exhaust valve cam molded lines switching mechanism that on the exhaust valve of every cylinder, is provided with switches to the exhaust valve big cam corresponding with this exhaust valve with cam profile.
7. controlling method as claimed in claim 6 is characterized in that, said controlling method also comprises: S3, utilize three-way catalyst that tail gas is handled.
8. controlling method as claimed in claim 6 is characterized in that, said predefined value A is 0.4MPa～0.5MPa.
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| CN106089454A (en) * | 2016-06-28 | 2016-11-09 | 重庆大学 | Electronic combined supercharging variable compression ratio gasoline engine system |
| CN112282943B (en) * | 2020-10-30 | 2021-08-06 | 吉林大学 | Effective thermal efficiency-based compression ratio control method for quality-adjusted engine |
| CN113202628A (en) * | 2021-06-02 | 2021-08-03 | 北京理工大学 | Two-stage low-compression-cycle implementation method, device and detection method |
| CN113389608B (en) * | 2021-07-21 | 2022-10-28 | 潍柴动力股份有限公司 | Multi-cylinder engine cam design method and multi-cylinder engine |
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