CN102168615B - Control method of EGR (exhaust gas recirculation) control system of engine - Google Patents
Control method of EGR (exhaust gas recirculation) control system of engine Download PDFInfo
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- CN102168615B CN102168615B CN 201110135232 CN201110135232A CN102168615B CN 102168615 B CN102168615 B CN 102168615B CN 201110135232 CN201110135232 CN 201110135232 CN 201110135232 A CN201110135232 A CN 201110135232A CN 102168615 B CN102168615 B CN 102168615B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 235000006040 Prunus persica var persica Nutrition 0.000 description 1
- 240000006413 Prunus persica var. persica Species 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The invention provides an EGR (exhaust gas recirculation) control system of an engine and a control method thereof. The EGR control system comprises an electric control unit and a valve mechanism, wherein corresponding to each cylinder, the valve mechanism is provided with an inlet valve consisting of a first inlet valve and a second inlet valve, and an exhaust valve consisting of a first exhaust valve and a second exhaust valve; the inlet valve is subject to control of an inlet cam shaft, and the exhaust valve is subject to an exhaust cam shaft; the first inlet valve and the second inlet valve are respectively subject to control of two cams that are arranged on the inlet cam shaft and different in lift range; the first exhaust valve and the second exhaust valve are respectively subject to control of two cams that are arranged on the exhaust cam shaft and different in lift range; and the electric control unit controls the work of the cams on the inlet cam shaft and the exhaust cam shaft through a transmission mechanism and changes valve timing and valve lift. With different loads, the electric control unit adopts different lift and phase combination ways to control the EGR rate of residues in the cylinder, thus improving the thermal efficiency of the engine.
Description
Technical field
The invention belongs to motor car engine manufacturing technology field, specially refer to EGR control system and the controlling method thereof of a kind of band Exhaust gas recirculation device (EGR) motor.
Background technique
Exhaust gas recirculatioon (Exhaust Gas Recirculation) refers to the technology that automobile engine burns a part of exhaust introducing air inlet once again after burning, it can reduce the nitrogen oxide (NOx) of discharging in the gas and improve fuel economy.Along with the strictness day by day of Abgasgesetz and riseing of fuel price, the application of EGR technology on motor more and more widely.At present engine interior EGR mainly is by VVT(Variable Valve Timing Variable Valve Time) and VVL(Variable Valve lift lift range variable) technology controls, early open by the slow pass of exhaust valve and intake valve, form certain Overlap(valve overlap) regulate the exhausted air quantity size that remains in the inlet and outlet road, reduce petrol engine pumping loss merit thereby can play, the thermal efficiency under the lift portion load.
Though said method has reduced the pumping loss merit to a certain extent, because this part EGR is residual in intake manifold or outlet pipe, tend to form mixed gas coking even charing on the intake duct wall, cause the oil consumption of motor to raise.In addition, because the size of valve overlap has determined exhauxt valve opens and IC Intake Valve Closes constantly, in different operating modes, often again with for there is certain contradiction in the IC Intake Valve Closes angle that takes full advantage of air inflow, cause internal EGR rate size not reach best requirement.
Summary of the invention
The objective of the invention is to propose a kind of EGR control system and controlling method thereof of motor, reach the purpose that residual EGR leads in the control cylinder by changing valve timing and valve lift, thereby improve the thermal efficiency of motor.
The EGR control system of motor of the present invention comprises ECU (Electrical Control Unit) and valve mechanism, key is that corresponding each cylinder body of described valve mechanism is provided with by first intake valve, the intake valve that second intake valve is formed, by first exhaust valve, the exhaust valve that second exhaust valve is formed, described intake valve utilizes admission cam shaft control, described exhaust valve utilizes exhaust cam shaft control, described first intake valve, second intake valve utilizes the cam control that is arranged at two different lift scopes on the admission cam shaft respectively, described first exhaust valve, second exhaust valve utilizes the cam control that is arranged at two different lift scopes on the exhaust cam shaft respectively, and described ECU (Electrical Control Unit) is by the cam work on transmission mechanism control admission cam shaft and the exhaust cam shaft.
Further, described ECU (Electrical Control Unit) links to each other with engine control system, so that the engine load signal that ECU (Electrical Control Unit) transmits according to engine control system is controlled the cam work on each admission cam shaft and the exhaust cam shaft.The general mode of hydraulic pressure that adopts is controlled the rotation of cam in the prior art, thereby reaches the contact range that changes between cam and the valve fore-set, realizes the purpose of control valve lift, and this is prior art, repeats no more herein.
Specifically, in two cams on the described admission cam shaft, first intake cam has first lift and second lift, and second intake cam has first lift and zero lift; In two cams on the described exhaust cam shaft, first exhaust cam has first lift and second lift, and second exhaust cam has first lift and zero lift; Described second lift is greater than zero and less than first lift.Above-mentioned first lift, second lift can be utilized the pointed one-tenth of peach of different sizes, and zero lift can utilize basic circle to form, and is prior art, repeats no more herein.
In the controlling method of the EGR control system of above-mentioned motor, the engine load signal that described ECU (Electrical Control Unit) transmits according to engine control system is controlled the cam work on each admission cam shaft and the exhaust cam shaft, thereby change the lift of first intake valve, second intake valve, first exhaust valve, second exhaust valve, and in exhaust stroke budc control exhaust valve closing, at aspirating stroke front half part control IC Intake Valve Closes.Lift and the unlatching, shut-in time of ECU (Electrical Control Unit) by control intake valve and exhaust valve, residual gas amount in the accurate control cylinder, make a part not have the waste gas of perfect combustion in aspirating stroke continues release, can (bear during the valve overlap), promote piston and move downward acting, thereby improved the thermal efficiency of motor.
Further, described first intake cam is controlled first intake valve, and second intake cam is controlled second intake valve, and first exhaust cam is controlled first exhaust valve, and second exhaust cam is controlled second exhaust valve; Described ECU (Electrical Control Unit) is divided into first group with first intake valve, first exhaust valve, second intake valve, second exhaust valve are divided into second group control to form four kinds of combinations simultaneously, described second group lift is directly proportional with the load of motor, every kind of lift of second group is corresponding first group two kinds of lifts all, and in same a kind of lift state of second group, first group lift is directly proportional with the load of motor.Under the motor different load, ECU (Electrical Control Unit) is by adopting different valve compound modes, can not only satisfy motor to the demand of air inflow, can also guarantee that motor is under different operating modes, remaining EGR leads in the scope an of the best in the cylinder, thereby can guarantee combustion stability, can farthest reduce fuel consumption rate again.
Specifically:
In above-mentioned controlling method, described motor is when the minimum load state, and described ECU (Electrical Control Unit) is controlled first intake valve and adopted second lift, controls second intake valve and adopts zero lift, control first exhaust valve and adopt second lift, control second exhaust valve and adopt zero lift; Described motor is when the maximum load state, and described ECU (Electrical Control Unit) is controlled first intake valve, second intake valve, first exhaust valve, second exhaust valve and all adopted first lift.
The EGR control system of motor of the present invention is simple in structure, and its controlling method can reach the purpose that residual EGR leads in the control cylinder by changing valve timing and valve lift, thereby improves the thermal efficiency of motor.
Description of drawings
Fig. 1 is first group of intake valve among the present invention, the valve lift curve schematic representation of exhaust valve.
Fig. 2 is second group of intake valve among the present invention, the valve lift curve schematic representation of exhaust valve.
Fig. 3 is the relation curve schematic representation of the corresponding exhaust gas inside cylinder residual rate of various combination and engine load in the controlling method of the present invention, rotating speed.
Indicate among the figure: 1, first lift of second group of exhaust valve; 2, first lift of second group of intake valve; 3, the zero lift of second group of exhaust valve; 4, the zero lift of second group of intake valve; 5, first lift of first group of exhaust valve; 6, first lift of first group of intake valve; 7, second lift of first group of exhaust valve; 8, second lift of first group of intake valve.
Embodiment
Describe the present invention in detail below in conjunction with specific embodiments and the drawings.
Embodiment 1:
Present embodiment the EGR control system of motor comprise ECU (Electrical Control Unit) and valve mechanism, corresponding each cylinder body of described valve mechanism is provided with by first intake valve, the intake valve that second intake valve is formed, by first exhaust valve, the exhaust valve that second exhaust valve is formed, described intake valve utilizes admission cam shaft control, described exhaust valve utilizes exhaust cam shaft control, described first intake valve, second intake valve utilizes the cam control that is arranged at two different lift scopes on the admission cam shaft respectively, described first exhaust valve, second exhaust valve utilizes the cam control that is arranged at two different lift scopes on the exhaust cam shaft respectively, described ECU (Electrical Control Unit) links to each other with engine control system, and by the cam work on transmission mechanism control admission cam shaft and the exhaust cam shaft.
Specifically, in two cams on the described admission cam shaft, first intake cam has first lift and second lift, and second intake cam has first lift and zero lift; In two cams on the described exhaust cam shaft, first exhaust cam has first lift and second lift, and second exhaust cam has first lift and zero lift; Described second lift is greater than zero and less than first lift.
In the controlling method of the EGR control system of above-mentioned motor, the engine load signal that described ECU (Electrical Control Unit) transmits according to engine control system is controlled the cam work on each admission cam shaft and the exhaust cam shaft, thereby change the lift of first intake valve, second intake valve, first exhaust valve, second exhaust valve, and in exhaust stroke budc control exhaust valve closing, at aspirating stroke front half part control IC Intake Valve Closes.
Specifically, described first intake cam is controlled first intake valve, and second intake cam is controlled second intake valve, and first exhaust cam is controlled first exhaust valve, and second exhaust cam is controlled second exhaust valve; Described ECU (Electrical Control Unit) is divided into first group with first intake valve, first exhaust valve, second intake valve, second exhaust valve is divided into second group controls to form the described four kinds of combinations of following table simultaneously, and its concrete lifting curve is seen Fig. 1, shown in Figure 2; Described second group lift is directly proportional with the load of motor, and every kind of lift of second group is corresponding first group two kinds of lifts all, and in same a kind of lift state of second group, first group lift is directly proportional with the load of motor.Namely in combination 1,2, second group lift all adopts zero lift, and first group is adopted second lift and first lift respectively along with the increase of engine load; In combination 3,4, second group lift all adopts first lift, and first group is adopted second lift and first lift respectively along with the increase of engine load.
In above-mentioned controlling method, motor is when the minimum load state, and ECU (Electrical Control Unit) is controlled first intake valve and adopted second lift 8, control second intake valve and adopt zero lift 4, control first exhaust valve and adopt second lift 7, control second exhaust valve and adopt zero lift 3, be i.e. combination 1 in the table; Motor is when the maximum load state, and ECU (Electrical Control Unit) is controlled first intake valve, second intake valve, first exhaust valve, second exhaust valve and all adopted first lift, i.e. combination 4 in the table.
Lift and the unlatching, shut-in time of ECU (Electrical Control Unit) by control intake valve and exhaust valve, residual gas amount in the accurate control cylinder, make a part not have the waste gas of perfect combustion in aspirating stroke continues release, can (bear during the valve overlap), promote piston and move downward acting, thereby improved the thermal efficiency of motor.As shown in Figure 3, under the motor different load, ECU (Electrical Control Unit) is by adopting different valve compound modes, can not only satisfy motor to the demand of air inflow, can also guarantee that motor is under different operating modes, remaining EGR leads in the scope an of the best in the cylinder, thereby can guarantee combustion stability, can farthest reduce fuel consumption rate again.
Claims (4)
1. the controlling method of the EGR control system of a motor, this EGR control system comprises ECU (Electrical Control Unit) and valve mechanism, described ECU (Electrical Control Unit) links to each other with engine control system; Corresponding each cylinder body of described valve mechanism is provided with by first intake valve, the intake valve that second intake valve is formed, by first exhaust valve, the exhaust valve that second exhaust valve is formed, described intake valve utilizes admission cam shaft control, described exhaust valve utilizes exhaust cam shaft control, described first intake valve, second intake valve utilizes the cam control that is arranged at two different lift scopes on the admission cam shaft respectively, described first exhaust valve, second exhaust valve utilizes the cam control that is arranged at two different lift scopes on the exhaust cam shaft respectively, and described ECU (Electrical Control Unit) is by the cam work on transmission mechanism control admission cam shaft and the exhaust cam shaft; The engine load signal that described ECU (Electrical Control Unit) transmits according to engine control system is controlled the cam work on each admission cam shaft and the exhaust cam shaft, thereby change the lift of first intake valve, second intake valve, first exhaust valve, second exhaust valve, and in exhaust stroke budc control exhaust valve closing, at aspirating stroke front half part control IC Intake Valve Closes; It is characterized in that described first intake cam controls first intake valve, second intake cam is controlled second intake valve, and first exhaust cam is controlled first exhaust valve, and second exhaust cam is controlled second exhaust valve; Described ECU (Electrical Control Unit) is divided into first group with first intake valve, first exhaust valve, second intake valve, second exhaust valve are divided into second group control to form four kinds of combinations simultaneously, described second group lift is directly proportional with the load of motor, every kind of lift of second group is corresponding first group two kinds of lifts all, and in same a kind of lift state of second group, first group lift is directly proportional with the load of motor.
2. the controlling method of the EGR control system of motor according to claim 1 is characterized in that first intake cam has first lift and second lift in two cams on the described admission cam shaft, and second intake cam has first lift and zero lift; In two cams on the described exhaust cam shaft, first exhaust cam has first lift and second lift, and second exhaust cam has first lift and zero lift; Described second lift is greater than zero and less than first lift.
3. the controlling method of the EGR control system of motor according to claim 2, it is characterized in that described motor is when the minimum load state, described ECU (Electrical Control Unit) is controlled first intake valve and is adopted second lift, control second intake valve and adopt zero lift, control first exhaust valve and adopt second lift, control second exhaust valve and adopt zero lift.
4. the controlling method of the EGR control system of motor according to claim 3, it is characterized in that described motor when the maximum load state, described ECU (Electrical Control Unit) is controlled first intake valve, second intake valve, first exhaust valve, second exhaust valve and is all adopted first lift.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110135232 CN102168615B (en) | 2011-05-24 | 2011-05-24 | Control method of EGR (exhaust gas recirculation) control system of engine |
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| CN 201110135232 CN102168615B (en) | 2011-05-24 | 2011-05-24 | Control method of EGR (exhaust gas recirculation) control system of engine |
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| CN102168615A CN102168615A (en) | 2011-08-31 |
| CN102168615B true CN102168615B (en) | 2013-07-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110359978B (en) * | 2019-07-12 | 2020-05-05 | 龙口中宇汽车风扇离合器有限公司 | Valve device and method controlled by electromagnetic valve |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0640749A1 (en) * | 1993-08-31 | 1995-03-01 | Aisin Seiki Kabushiki Kaisha | Device for controlling a valve timing for an internal combustion engine |
| US7207300B2 (en) * | 2004-01-15 | 2007-04-24 | Toyota Jidosha Kabushiki Kaisha | Variable valve mechanism |
| CN101451453A (en) * | 2007-12-05 | 2009-06-10 | 现代自动车株式会社 | Valve system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001123811A (en) * | 1999-10-25 | 2001-05-08 | Toyota Motor Corp | Valve characteristic varying system for internal combustion engine |
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2011
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0640749A1 (en) * | 1993-08-31 | 1995-03-01 | Aisin Seiki Kabushiki Kaisha | Device for controlling a valve timing for an internal combustion engine |
| US7207300B2 (en) * | 2004-01-15 | 2007-04-24 | Toyota Jidosha Kabushiki Kaisha | Variable valve mechanism |
| CN101451453A (en) * | 2007-12-05 | 2009-06-10 | 现代自动车株式会社 | Valve system |
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