CN112502841A - Method for controlling a switchable valvetrain mechanism - Google Patents
Method for controlling a switchable valvetrain mechanism Download PDFInfo
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- CN112502841A CN112502841A CN201910870949.XA CN201910870949A CN112502841A CN 112502841 A CN112502841 A CN 112502841A CN 201910870949 A CN201910870949 A CN 201910870949A CN 112502841 A CN112502841 A CN 112502841A
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- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000002485 combustion reaction Methods 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 description 58
- 239000000446 fuel Substances 0.000 description 19
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention relates to a method for controlling a switchable valve train of a piston internal combustion engine, comprising two inlet valves (IN x.1, IN x.2) and two outlet valves (EX x.1, EX x.2) per cylinder, wherein the valve stroke is predefined by a cam and is transmitted to a gas exchange valve by means of a stroke transmission element. The cams for actuating the inlet valves and the first exhaust valves are designed as standard cams, and the cams for actuating the second exhaust valves are designed as special cams with additional travel cams. The valve strokes of the exhaust valves (EX x.1, EX x.2) can be switched off in groups by means of a stroke transmission element. In a first operating mode (mode 1) provided for normal driving, the valve strokes of all first exhaust valves (EX x.1) are not closed, and the valve strokes of all second exhaust valves (EX x.2) are closed. In order to control the combustion temperature and the exhaust gas temperature, three additional operating modes (mode 2 to mode 4) or six additional operating modes (mode 2 to mode 7) are additionally provided.
Description
Technical Field
The invention relates to a method for controlling a switchable valve train of a piston internal combustion engine, having two inlet valves and two exhaust valves for each cylinder, the valve strokes of which are each predefined by a cam of at least one camshaft and can be transmitted to the corresponding gas exchange valve by means of an associated stroke transmission element, wherein the cams for actuating the inlet valves and the first exhaust valves are designed as standard cams each having a standard stroke cam, and the cams for actuating the second exhaust valves are designed as special cams each having a standard stroke cam and an additional stroke cam, wherein the transmittable valve strokes of the exhaust valves can be selectively switched off in groups by means of the switchable stroke transmission elements.
Background
It is generally known that: reducing the combustion temperature in the combustion chamber by means of exhaust gas recirculation in a piston internal combustion engine, thereby enabling nitrogen oxides NO to be reducedXIs performed. It is also known that at cold start and low operating temperatures of piston internal combustion engines, the exhaust gas temperature in the exhaust gas aftertreatment region in the exhaust pipe increases due to exhaust gas recirculation and can thus be higher than the minimum temperature required for the chemical reactions taking place there. The exhaust gas recirculation can be effected externally via an exhaust gas recirculation line with a controllable exhaust gas recirculation valve or internally by means of a scavenging valve opening in addition to the periodic opening of the exhaust or intake valve.
DE 10317685 a1 discloses a switchable valvetrain of a piston internal combustion engine in which internal exhaust gas recirculation can be activated independently of the periodic opening of the exhaust and intake valves by additional opening of the associated scavenging valves. The exhaust gas recirculation can be switched on for each cylinder either by means of an electromagnetic actuator and a steering column or by means of an additional stroke cam which can be extended and retracted in the camshaft axially adjacent to an associated standard stroke cam and which acts via a valve bridge on two functionally identical gas exchange valves.
DE 102005003611 a1 describes a switchable valve train of a piston internal combustion engine, in which the valve strokes of a standard stroke cam arranged centrally on an associated camshaft and two additional stroke cams arranged axially on both sides can each be transmitted to at least one gas exchange valve via a switchable roller tappet for each cylinder. In the non-switching state of the roller tappet, in which only the valve travel of the standard travel cam is transmitted via the inner tappet element to the gas exchange valve, the outer tappet element is decoupled from the inner tappet element. In the switched state of the roller tappet, in which both the valve travel of the normal-stroke cam and the valve travel of the additional-stroke cam are transmitted to the gas exchange valve, the internal exhaust gas recirculation is switched on.
Finally, DE 102016208471 a1 discloses a hydraulic assembly of a switchable valve train of a piston internal combustion engine having a switchable stroke-transmitting element, wherein the switchable valve strokes of the gas exchange valves can be selectively switched off or switched in groups. In order to achieve internal exhaust gas recirculation in triple steps, it is provided in a piston internal combustion engine having a four-valve cylinder head that the switchable stroke transmission elements of a first exhaust valve group assigned to an additional stroke cam with a small additional stroke and a second exhaust valve group assigned to an additional stroke cam with a large additional stroke can be switched independently of one another. In the non-switched state of the stroke transmission element, only the valve stroke of the standard stroke cam is transmitted to the exhaust valve. In the switched state of the stroke transmission element, both the valve stroke of the standard stroke cam and the valve stroke of the additional stroke cam are transmitted to the exhaust valve.
In addition to the above-described embodiments, the switchable stroke-transmitting element can also be designed as a switchable tappet, a switchable tilting lever, a switchable air door lever or a switchable supporting element.
The present invention relates to a switchable valvetrain of a piston internal combustion engine having a four-valve cylinder head, wherein the cams for actuating the intake valves and the first exhaust valves are designed as standard cams each having a standard stroke cam, and the cams for actuating the second exhaust valves are designed as special cams each having a standard stroke cam and an additional stroke cam. The variability of such valve trains is that the transmittable valve strokes of at least one exhaust valve can be selectively switched off and on in groups hydraulically, mechanically or electronically via associated stroke transmission elements.
Disclosure of Invention
The object on which the invention is based is to provide a method for controlling a switchable valve drive of the type of construction mentioned at the outset, by means of which a suitable control of the combustion temperature in the combustion chamber and of the exhaust gas temperature in the exhaust-gas aftertreatment region in the exhaust-gas tract can be achieved with low fuel consumption and with as little pollutant emissions as possible.
In a first embodiment of a switchable valve drive according to the features of the preamble of claim 1, only the valve drive of the exhaust valves can be selectively switched off in groups, wherein in a first operating mode (mode 1) provided for normal operation, in which the transferable valve strokes of all first exhaust valves are not switched off and the transferable valve strokes of all second exhaust valves are switched off, at least one of the following three further operating modes is additionally provided in addition to the first operating mode (mode 1), namely:
in the second operating mode (mode 2) provided for cold start and low operating temperatures at moderate to high motor loads, the transferable valve strokes of all the exhaust valves are not closed, whereby the exhaust gas temperature in the exhaust gas purification region in the exhaust pipe is increased at high air and fuel flow rates, so that the chemical reaction for reducing the exhaust gas pollutants can be realized or improved.
In the third operating mode (mode 3) provided for cold start and low operating temperatures at low to medium motor loads, the transferable valve strokes of all the first exhaust valves are turned off and the transferable valve strokes of all the second exhaust valves are not turned off. In this way, the exhaust gas temperature in the exhaust gas purification region in the exhaust gas line is increased at low air and fuel flow rates, so that chemical reactions for reducing the exhaust gas pollutants can be achieved or improved.
The additional travel cam for the special cam of the second exhaust valve is currently preferably designed as a rear travel cam, i.e. arranged behind the standard travel cam in the direction of rotation of the exhaust camshaft. As a result, internal exhaust gas recirculation is achieved, as in the previously described operating modes 2 and 3, without the stroke transmission of the second exhaust valve being switched off.
In the fourth operating mode (mode 4) provided for thrust-free forward driving or thrust-free forward coasting, the transferable valve strokes of all the exhaust valves are closed, so that the exhaust pipe is flushed with fresh air, and the exhaust gas temperature in the exhaust pipe is prevented from falling below the minimum temperature required for the exhaust gas aftertreatment function. In addition, the exhaust pipe is flushed with oxygen from the air, so that possible damage to the catalyst and/or other devices arranged there is successfully avoided.
In a second embodiment of a switchable valve drive according to the features of the preamble of claim 2, both the valve strokes of the inlet valves and the valve strokes of the outlet valves can be selectively closed in groups, wherein in a first operating mode (mode 1) provided for normal operation, in which the transferable valve strokes of all inlet valves and of all first outlet valves are not closed and the transferable valve strokes of all second outlet valves are closed, in addition to the first operating mode (mode 1), at least one of the following six further operating modes (modes 2 to 7) is additionally provided, namely:
in the second operating mode (mode 2) provided for cold start and low operating temperatures at moderate to high motor loads, the transferable valve strokes of all inlet valves and all outlet valves are not closed, so that the exhaust gas temperature in the exhaust gas purification area in the exhaust pipe is increased under high air flow and fuel flow, thereby realizing or improving the chemical reaction for reducing the harmful substances in the exhaust gas.
In the third operating mode (mode 3) provided for cold start and low operating temperatures at low to medium motor loads, the transferable valve strokes of all inlet valves and of all second outlet valves are not switched off, while the transferable valve strokes of all first outlet valves are switched off, so that the exhaust gas temperature in the exhaust gas purification area in the exhaust pipe is increased at low air and fuel flow rates, thereby enabling or improving the chemical reaction for reducing the exhaust gas pollutants.
In the fourth operating mode (mode 4) provided for thrust-free forward driving or thrust-free sliding forward driving, the transferable valve strokes of all the inlet valves and all the outlet valves are closed, so that the combustion chamber and the exhaust pipe are flushed with fresh air, and the exhaust gas temperature in the exhaust pipe is prevented from falling below the minimum temperature required for the exhaust gas aftertreatment function.
In the fifth operating mode (mode 5) provided for medium operating temperatures and low motor loads, the transferable valve strokes of all inlet valves and all outlet valves are switched off in only a few cylinders and additionally the transferable valve stroke of the second outlet valve is switched off in the remaining cylinders, whereby the relevant cylinder is switched off for fuel saving and a load point lift can be achieved at low air and fuel flow rates, for example by increasing the load capacity of the generator.
In the sixth operating mode (mode 6) provided for low operating temperatures and medium motor loads, the transferable valve strokes of all inlet valves and all outlet valves are switched off in only a few cylinders, whereby the relevant cylinder is switched off for fuel saving, the increase in the exhaust gas temperature is achieved by exhaust gas recirculation via the second outlet valves of the remaining cylinders, and a load point increase can be achieved in the case of medium air flow and fuel flow, for example by increasing the load capacity of the generator.
In a seventh operating mode (mode 7) provided for low operating temperatures and low motor loads, the transferable valve strokes of all inlet valves and all outlet valves are switched off in only a few cylinders and additionally the transferable valve stroke of the first exhaust valve is switched off in the remaining cylinders, whereby the relevant cylinder is switched off for fuel saving, the increase of the exhaust gas temperature is achieved by exhaust gas recirculation through the second exhaust valves of the remaining cylinders, and the load point increase can be achieved in low air flow and fuel flow conditions, for example by increasing the load capacity of the generator.
Drawings
To further illustrate the invention, the specification is attached with two embodiments of the accompanying drawings. Shown in the drawings are:
figure 1 is a schematic diagram of a first embodiment of a switchable valvetrain of a piston internal combustion engine with switchable exhaust valve travel,
figure 1a is an axial view of a standard cam of an exhaust camshaft according to the valve mechanism of figure 1,
figure 1b shows an axial view of a special cam of the exhaust camshaft of the valve train according to figure 1,
figure 2 is a table listing preferred switching combinations of the valve mechanism according to figure 1,
FIG. 3 is a schematic diagram of a second embodiment of a switchable valvetrain of a piston internal combustion engine with an intake valve stroke and an exhaust valve stroke that can be closed, an
Fig. 4 shows a table listing preferred switching combinations of the valve drive according to fig. 3.
Detailed Description
IN the schematic illustration of fig. 1, a four-valve cylinder head of a four-cylinder inline motor is shown, which has two inlet valves IN1.1, IN 1.2 for each cylinder (cylinder 1, cylinder 2, cylinder 3, cylinder 4); IN 2.1, IN 2.2; IN 3.1, IN 3.2; IN 4.1, IN 4.2 and two exhaust valves EX 1.1, EX 1.2; EX 2.1, EX 2.2; EX 3.1, EX 3.2; EX4.1, EX 4.2. Intake valves IN1.1 to IN 4.1; the valve strokes IN 1.2 to IN 4.2 are each predefined by a cam of an intake camshaft, not shown, and can be transmitted to the respective gas exchange valve by means of an associated stroke transmission element. The stroke transmission element is designed, for example, as a valve plunger.
The cams for intake valves IN1.1 to IN 4.1, IN 1.2 to IN 4.2 are configured as standard cams and each have a standard stroke cam. The stroke transmission elements for intake valves IN1.1 to IN 4.1, IN 1.2 to IN 4.2 are currently not configured to be switchable, so that the valve stroke of the cam of the intake camshaft is always transmitted to intake valves IN1.1 to IN 4.1, IN 1.2 to IN 4.2. To indicate the assignment of the standard cams to the non-shiftable stroke-transmitting element, the intake valves IN x.1, IN x.2 are shown as solid circular lines.
The valve strokes of the exhaust valves EX 1.1 to EX4.1, EX 1.2 to EX 4.2 are each predefined by the cams 6, 10 of the exhaust camshaft 2 shown in fig. 1a and 1b and can be transmitted to the respective gas exchange valve by means of an associated stroke transmission element. Cams 6 of first exhaust valves EX 1.1 to EX4.1 are designed as standard cams according to fig. 1a and each have a standard travel cam 8. The cams 10 of the second exhaust valves EX 1.2 to EX 4.2 are designed as special cams according to fig. 1b and each have a standard stroke cam 12 and an additional stroke cam 14. The additional stroke cam 14 of the second exhaust valves EX 1.2 to EX 4.2 acts as a rear stroke cam as a result of the direction of rotation of the exhaust camshaft 2, which is illustrated in fig. 1a and 1b by the direction arrow 4.
The stroke transmission elements of the exhaust valves EX 1.1 to EX4.1, EX 1.2 to EX 4.2 are switchable and can be switched in groups in such a way that the transmittable valve strokes of the cams 6, 10 of the exhaust camshaft 2 can be switched off independently of one another in groups x of the first and second exhaust valve groups EX x.1, EX x.2. To indicate the assignment of the standard cam 6 and the switchable stroke-transmitting element, the first exhaust valve EX x.1 is shown in a simple circular dashed line. In order to indicate the assignment of the special cam 10 and the switchable stroke-transmitting element, the second exhaust valve EX x.2 is shown in dash-dot lines.
The table shown in fig. 2 illustrates four operating modes of the first valve train (mode 1, mode 2, mode 3, mode 4) with different switching combinations of the exhaust valves EX x.1, EX x.2.
In the first operating mode (mode 1) provided for normal operation, the transferable valve strokes of all the first exhaust valves EX x.1 are not closed and the transferable valve strokes of all the second exhaust valves EX x.2 are closed.
In the second operating mode (mode 2) provided for cold start and low operating temperatures at medium to high motor loads, the transferable valve strokes of all exhaust valves EX x.1, EX x.2 are not switched off, whereby the exhaust gas temperature in the exhaust gas purification region in the exhaust pipe is increased at high air and fuel flow rates, so that chemical reactions for reducing exhaust gas pollutants can be achieved or facilitated.
In the third operating mode (mode 3) provided for cold start and low operating temperatures at low to medium motor loads, the transferable valve strokes of all the first exhaust valves EX x.1 are turned off and the transferable valve strokes of all the second exhaust valves EX x.2 are not turned off. In this way, the exhaust gas temperature in the exhaust gas purification region in the exhaust gas line is increased at low air and fuel flow rates, so that chemical reactions for reducing the exhaust gas pollutants can be achieved or facilitated.
The additional stroke cam 14 for the special cam 10 of the second exhaust valve is currently preferably designed as a rear stroke cam, i.e. arranged behind the standard stroke cam 12 in the direction of rotation of the exhaust camshaft. As a result, internal exhaust gas recirculation is achieved as in the previously described operating modes 2 and 3 without stroke transmission of the second exhaust valve being switched off.
In a fourth operating mode (mode 4) provided for so-called coasting operation, in which the transferable valve strokes of all exhaust valves EX x.1, EX x.2 are closed, the exhaust pipe is flushed with fresh air, so that the exhaust gas temperature in the exhaust pipe is prevented from dropping below the minimum temperature required for the exhaust gas aftertreatment function, the vehicle coasts forward without being driven. In addition, the exhaust line is filled with oxygen from the air, so that possible damage to the catalytic converter and/or other devices arranged there is successfully avoided.
The four-valve cylinder head of the four-cylinder inline motor shown in the schematic view of fig. 3 differs from the cylinder head according to fig. 1 in that: the stroke transmission element of the inlet valves IN x.1, IN x.2 is also designed to be switchable and can be actuated IN such a way that the switchable valve stroke of the inlet valves IN x.1, IN x.2 can also be switched off cylinder by cylinder. Furthermore, the switchable stroke transmission element of the exhaust valves EX x.1, EX x.2 can now also be actuated cylinder by cylinder, so that the transmittable valve stroke of the exhaust valves EX x.1, EX x.2 can also be switched off cylinder by cylinder. In order to indicate the assignment of the standard cam and the switchable stroke-transmitting element, the inlet valve is also shown here with a simple circular broken line.
The table IN fig. 4 shows seven operating modes of the second valve train (mode 1, mode 2, mode 3, mode 4, mode 5, mode 7) with different switching combinations of the intake valves IN x.1, IN x.2 and the exhaust valves EX x.1, EX x.2.
The first three operating modes (mode 1, mode 2, mode 3) of the second valve train according to fig. 3 are identical to the corresponding operating modes (mode 1, mode 2, mode 3) of the first valve train according to fig. 1. The fourth operating mode (mode 4) of the second valve drive according to fig. 3 provided for thrust-free forward coasting differs from the corresponding operating mode (mode 4) of the first valve drive according to fig. 1 in that: the transferable valve strokes of all intake valves IN x.1, IN x.2 are also now closed, so that additionally flushing of the combustion chamber with fresh air and condensation losses IN the subsequent load operation are avoided.
IN the fifth operating mode (mode 5) provided for medium operating temperatures and low motor loads, the transferable valve stroke of all inlet valves IN1.1, IN 4.1, IN 1.2, IN 4.2 and all outlet valves EX 1.1, EX4.1, EX 1.2, EX 4.2 is switched off only IN the first cylinder 1 and the fourth cylinder 4 and additionally the transferable valve stroke of the second outlet valves EX 2.2, EX 3.2 is switched off IN the remaining cylinders (cylinder 2, cylinder 3), whereby the aforementioned cylinders (cylinder 1, cylinder 4) are switched off for fuel saving and a load point increase can be achieved IN low air and fuel flow conditions, for example by increasing the load capacity of the generator.
IN the sixth operating mode (mode 6) provided for low operating temperatures and medium motor loads, the transferable valve strokes of all inlet valves IN1.1, IN 4.1, IN 1.2, IN 4.2 and all outlet valves EX 1.1, EX4.1, EX 1.2, EX 4.2 are switched off only IN the first cylinder 1 and the fourth cylinder 4, whereby these cylinders are switched off for fuel saving, the increase IN the exhaust gas temperature is achieved by exhaust gas recirculation via the second outlet valves EX 2.2, EX 3.2 of the remaining cylinders (cylinder 2, cylinder 3), and the load point increase can be achieved IN the case of medium air flow and fuel flow, for example, by increasing the load capacity of the generator.
IN the seventh operating mode (mode 7) provided for low operating temperatures and low motor loads, the transferable valve stroke of all the intake valves IN1.1, IN 4.1, IN 1.2, IN 4.2 and all the exhaust valves EX 1.1, EX4.1, EX 1.2, EX 4.2 IN the first cylinder 1 and the fourth cylinder 4 is switched off and additionally the transferable valve stroke of the first exhaust valve EX 2.1, EX 3.1 IN the remaining cylinders (cylinder 2, cylinder 3) is switched off, whereby the aforementioned cylinders (cylinder 1, cylinder 4) are shut off for fuel saving, the exhaust gas temperature is increased by exhaust gas recirculation via the second exhaust valves EX 2.2, EX 3.2 of the remaining cylinders (cylinder 2, cylinder 3), and load point boosting can be achieved at low air and fuel flow conditions, for example, by increasing the load capacity of the generator.
List of reference numerals
2 camshaft, exhaust camshaft
4 arrow of direction of rotation, direction of rotation
6-cam, standard cam
8 standard stroke cam
10 cam, special cam
12 standard stroke cam
14 additional stroke cam, rear stroke cam
A first exhaust valve of the EX x.1 cylinder; group x of first exhaust valves
A second exhaust valve of the EX x.2 cylinder; group x of second exhaust valves
A first intake valve of the IN x.1 cylinder; set x of first inlet valves
A second intake valve of the IN x.2 cylinder; set x of second inlet valves
First cylinder of 1 x cylinders
Second cylinder of 2 x cylinders
Third cylinder of 3 x cylinders
Fourth cylinder of 4 x cylinders
Claims (2)
1. Method for controlling a switchable valve train of a reciprocating internal combustion engine, having two inlet valves (IN x.1, IN x.2) and two outlet valves (EX x.1, EX x.2) for each cylinder (cylinder 1, cylinder 2, cylinder 3, cylinder 4), the valve strokes of which are each predefined by a cam (6, 10) of at least one camshaft (2) and which can be transmitted to the corresponding gas exchange valve by means of an associated stroke transmission element, wherein the cams (6) for actuating the inlet valves (IN x.1, IN x.2) and the first outlet valve (EX x.1) are designed as standard cams each having a standard stroke cam (8), and the cam (10) for actuating the second outlet valve (EX x.2) is designed as a special cam each having a standard stroke cam (12) and an additional stroke cam (14), wherein the transferable valve strokes of the exhaust valves (EX x.1, EX x.2) can be selectively closed in a grouped manner by means of a switchable stroke transfer element, characterized in that in a first operating mode (mode 1) provided for normal driving, the transferable valve strokes of all the first exhaust valves (EX x.1) are not closed and the transferable valve strokes of all the second exhaust valves (EX x.2) are closed, and in addition to the first operating mode (mode 1), at least one of the following three further operating modes (mode 2, mode 3, mode 4) is provided, namely:
a second operating mode (mode 2) provided for cold start and low operating temperatures at medium to high motor loads, in which the transferable valve strokes of all the exhaust valves (EX x.1, EX x.2) are not closed,
a third operating mode (mode 3) provided for cold start and low operating temperatures at low to medium motor loads, in which the transferable valve strokes of all the first exhaust valves (EX x.1) are switched off and the transferable valve strokes of all the second exhaust valves (EX x.2) are not switched off, and
a fourth operating mode (mode 4) is provided for thrust-free forward driving, in which transmittable valve strokes of all exhaust valves (EX x.1, EX x.2) are closed.
2. Method for controlling a switchable valve train of a reciprocating internal combustion engine, having two inlet valves (IN x.1, IN x.2) and two outlet valves (EX x.1, EX x.2) for each cylinder (cylinder 1, cylinder 2, cylinder 3, cylinder 4), the valve strokes of which are each predefined by a cam (6, 10) of at least one camshaft (2) and which can be transmitted to the corresponding gas exchange valve by means of an associated stroke transmission element, wherein the cams (6) for actuating the inlet valves (IN x.1, IN x.2) and the first outlet valve (EX x.1) are designed as standard cams each having a standard stroke cam (8), and the cam (10) for actuating the second outlet valve (EX x.2) is designed as a special cam each having a standard stroke cam (12) and an additional stroke cam (14), wherein the transferable valve strokes of the inlet valves (IN x.1, IN x.2) and the outlet valves (EX x.1, EX x.2) can be selectively switched off IN groups by means of a switchable stroke transmission element, characterized IN that IN a first operating mode (mode 1) provided for normal operation, the transferable valve strokes of all inlet valves (IN x.1, IN x.2) and all first outlet valves (EX x.1) are not switched off and the transferable valve strokes of all second outlet valves (EX x.2) are switched off, IN addition to which first operating mode (mode 1) at least one of the following six further operating modes (mode 2, mode 3, mode 4, mode 5, mode 6, mode 7) is additionally provided, namely:
a second operating mode (mode 2) provided for cold start and low operating temperatures at medium to high motor loads, IN which the transferable valve strokes of all inlet valves (IN x.1, IN x.2) and all exhaust valves (EX x.1, EX x.2) are not switched off,
a third operating mode (mode 3) provided for cold start and low operating temperatures at low to medium motor loads, IN which the transferable valve strokes of all inlet valves (IN x.1, IN x.2) and all second outlet valves (EX x.2) are not switched off and the transferable valve strokes of all first outlet valves (EX x.1) are switched off,
a fourth operating mode (mode 4) provided for thrust-free forward driving, IN which transmittable valve strokes of all intake valves (IN x.1, IN x.2) and all exhaust valves (EX x.1, EX x.2) are closed,
a fifth operating mode (mode 5) provided for medium operating temperatures and low motor loads, IN which transferable valve stroke off of all inlet valves (inx.1, inx.2) and all outlet valves (EX x.1, EX x.2) IN only a few cylinders (cylinders 1, 2) and additionally transferable valve stroke off of the second outlet valve (EX x.2) IN the remaining cylinders (cylinders 2, 3),
a sixth operating mode (mode 6) provided for low operating temperatures and medium motor loads, IN which transmittable valve strokes of all intake valves (IN x.1, IN x.2) and all exhaust valves (EX x.1, EX x.2) are closed IN only a few cylinders (cylinder 1, cylinder 4), and
a seventh operating mode (mode 7) provided for low operating temperatures and low motor loads, IN which transferable valve stroke of all inlet valves (inx.1, inx.2) and all outlet valves (EX x.1, EX x.2) is switched off only IN a few cylinders (cylinders 1, 4) and additionally transferable valve stroke of the first outlet valve (EX x.1) is switched off IN the remaining cylinders (cylinders 2, 3).
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| JP2004124752A (en) * | 2002-09-30 | 2004-04-22 | Mazda Motor Corp | Control device for spark ignition type engine with supercharger |
| JP2006144711A (en) * | 2004-11-22 | 2006-06-08 | Mazda Motor Corp | Intake and exhaust controller for four cycle gasoline engine |
| JP2007056701A (en) * | 2005-08-22 | 2007-03-08 | Mazda Motor Corp | Spark ignition four-cycle engine |
| DE102007035305A1 (en) * | 2007-07-27 | 2009-01-29 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Gas exchange controlling device for internal-combustion engine, has inlet cross section controlled by inlet valve larger than another inlet cross section controlled by another inlet valve |
| DE102014204447A1 (en) * | 2013-07-23 | 2015-01-29 | Ford Global Technologies, Llc | Engine operation method and motor vehicle |
| DE102016225050A1 (en) * | 2016-12-14 | 2018-06-14 | Volkswagen Aktiengesellschaft | Internal combustion engine and method for operating an internal combustion engine |
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