The present disclosure relates generally to an internal combustion engine, and more particularly relates to a variable valve timing arrangement for the internal combustion engine.
Various developments have been made in the control and design of an internal combustion engine to improve fuel efficiency while meeting ever stricter emission requirements. Improvements in valve timing arrangements have been made to control timing as well as a degree of opening of the intake and exhaust valves. As the internal combustion engine are required to operate at a range of speeds and loading conditions, the variable valve timing arrangement may allow the flow of gases into and from the engine to be tailored based on the operating conditions.
PCT Publication Number 2006/092312 discloses a variable mechanical valve control of an internal combustion engine including a bottom camshaft for adjusting a valve stroke and an opening and closing time, said valve control enabling an extremely compact transmission gear to be achieved between a push rod drive and the inlet and outlet valves, to reduce the number of components required for the transmission gear and to obtain a mechanical valve train that is completely variable, with a bottom camshaft. To achieve this, an intermediate lever is connected to a valve push rod by means of a shaft, in such a way that a slide gate roller, which is rotatably mounted on the shaft, is displaced by the camshaft in a slide gate. According to the invention, a first contact surface on the intermediate lever is supported in a reinforced manner by means of a spring on an eccentric shaft, or on a second contact surface and a lever is displaced using a working curve, said lever opening and/or closing the two-way gas valves. Elements are also provided, in particular on a lifter that is located on the push rod for the additional adjustment of the phase position of the valve elevations of the two-way gas valves with simultaneous play-free adjustment of the valve stroke and the invention is also equipped with elements for the additional independently controllable valve stroke opening and closing for each camshaft rotation.
In one aspect, a variable valve timing arrangement for an engine system is disclosed. The timing arrangement includes a cam lobe, a cam follower, a pushrod, a pushrod rotation mechanism, and a cam follower adjustment mechanism. The cam follower is configured to follow the cam lobe, the pushrod is operably connected with the cam follower. The pushrod rotation mechanism is configured to selectively rotate the pushrod. The cam follower adjustment mechanism is configured to reposition the cam follower based on the rotation of the pushrod.
In another aspect, a method of varying valve timing in the engine system is disclosed. The method includes determining the engine operating parameter, and selectively actuating the pushrod rotation mechanism to rotate the pushrod based on the engine operating parameter. The method further includes repositioning the cam follower by the cam follower adjustment mechanism based on the rotation of the pushrod.
Reference will now be made in detail to specific embodiments or features, examples of which are illustrated in the accompanying drawings. Generally, corresponding reference numbers will be used throughout the drawings to refer to the same or corresponding parts.
The cylinder assembly 106 includes a combustion chamber 108. The cylinder assembly 106 may include one or more overhead valves such as intake valves 110, to control air flow into the combustion chamber 108. A hollow runner or intake manifold 112 may be formed in or attached to the engine block 104 such that it extends over or proximate to each of the cylinder assemblies 106. The intake manifold 112 may communicate with an intake line 114 that directs air to the engine 102. Fluid communication between the intake manifold 112 and the cylinder assemblies 106 may be established by a plurality of intake runners 116 extending from the intake manifold 112. In the illustrated embodiment, the intake valves 110 open and close to selectively introduce the intake air from the intake manifold 112 into the combustion chamber 108.
The cylinder assembly 106 further includes one or more exhaust valves 118 to direct exhaust gases out of the combustion chamber 108 after a combustion event. An exhaust manifold 120 communicating with an exhaust line 122 may be disposed in or proximate to the engine block 104 such that it extends over or proximate to each of the cylinder assemblies 106. The exhaust manifold 120 may receive exhaust gasses by selective opening and closing of the one or more exhaust valves 118 associated with each cylinder assembly 106. The exhaust manifold 120 may communicate with the cylinder assemblies 106 through exhaust runners 124 extending from the exhaust manifold 120.
As shown in the illustrated embodiment, the intake valves 110 and the exhaust valves 118 are provided in an overhead position of the cylinder assemblies 106 and are selectively actuated by a camshaft 126 disposed within the engine block 104. In alternative embodiments, at least one of the intake valves 110 or the exhaust valves 118 may be placed at the overhead position and other intake and/or exhaust valves 110, 118 may be disposed in the engine block 104 such as at a sidewall of the cylinder assemblies 106 or other positions as known in the art.
The engine system 100 includes a fuel system 128 configured to supply fuel to the engine 102 during operation. In the illustrated embodiment, the fuel system 128 includes a fuel reservoir 130 that can accommodate a hydrocarbon-based fuel such as diesel, gasoline etc. A fuel line 132 directs the fuel from the fuel reservoir 130 into the cylinder assemblies 106. To pressurize the fuel and force it through the fuel line 132, a fuel pump 134 may be disposed in the fuel line 132. An optional fuel conditioner 136 may also be disposed in the fuel line 132 to filter the fuel or otherwise condition the fuel by, for example, introducing additives to the fuel, heating the fuel, removing water, and the like.
To introduce the fuel into the cylinder assemblies 106, the fuel line 132 may be in fluid communication with one or more fuel injectors 138 that are associated with each of the cylinder assemblies 106. While the illustrated embodiment depicts the fuel line 132 terminating at the fuel injectors 138, the fuel line 132 may establish a fuel loop that continuously circulates fuel through the plurality of fuel injectors 138 and, optionally, delivers unused fuel back to the fuel reservoir 130. Alternatively, the fuel line 132 may include a fuel collector volume or rail (not shown), which supplies pressurized fuel to the fuel injectors 138. The fuel injectors 138 may be electrically actuated devices that selectively introduce a measured or predetermined quantity of fuel into each cylinder assemblies 106. In alternative embodiments, the engine system 100 may include other fuel systems 128 as known in the art.
To coordinate and control the various systems and components associated with the engine system 100, the engine system 100 includes an electronic or computerized control unit, module, or controller 140. The controller 140 may be adapted to monitor various operating parameters and to responsively regulate various variables and functions affecting operations of the engine system 100. The controller 140 may include a microprocessor, an application specific integrated circuit (ASIC), or other appropriate circuitry, and may have memory or other data storage capabilities. The controller 140 may perform operations, include functions, steps, routines, data tables, data maps, charts, and the like, saved in, and executable from, read only memory, or another electronically accessible storage medium, to control the engine system 100. Although in
The controller 140 may include means for determining various engine operating parameters, based at least in part, on signals received from one or more engine operating parameter sensors associated with the engine system 100. The engine operating parameter sensors may be configured to generate engine operating parameter signals indicative of a particular engine operating parameter. In an embodiment, the controller may determine engine speed and cylinder pressure using a speed sensor 142 and one or more cylinder pressure sensors 144. The speed sensor 142 and the cylinder pressure sensors 144 may be operatively connected to the controller 140 via a first communication link 146 and a second communication link 148, respectively. Alternatively, the engine operating parameters may include, but are not limited to, loading conditions, power output, engine temperature, fuel mass flow rate, air mass flow rate, and the like. In one embodiment, the controller 140 is configured to generate a desired valve timing signal indicative of a desired valve timing to control a variable valve timing arrangement 150 via a third communication link 151 as a function of the engine operating parameters, which is further explained in relation to
Referring now to
The cam follower 152 may be a roller-type follower. Alternative embodiments of the cam follower 152 may include, but are not limited to, a flat follower, a point/knife follower, or an offset follower. The rotary motion of the camshaft 126 may be converted to a reciprocating motion of the cam follower 152 via the cam lobes 158. In the illustrated embodiment, the cam follower 152 is rotatably supported at a distal end of a tappet 160.
A pushrod 162 may be operatively connected with the cam follower 152. The pushrod 162 may be rotatably mounted at a proximal end of the tappet 160. The pushrod 162 may be connected to a rocker arm 164. The pushrod 162 may be linked to the tappet 160 by way of a first joint 166, such as, a ball-and-socket, a swivel, or a turn-and-slide joint. The pushrod 162 may be linked to the rocker arm 164 by way of a second joint 168, such as a ball-and-socket, a swivel, or a turn-and-slide joint. As illustrated, the intake valve 110 may be actuated by the rocker arm 164, which is articulated with the tappet 160 and the pushrod 162, to push at the intake valve 110. It will apparent to a person having ordinary skill in the art that, a substantially similar valve actuation mechanism may also be provided for the exhaust valve 118.
The variable valve timing arrangement 150 may include a pushrod rotation mechanism 170 configured to selectively rotate the pushrod 162 based on the desired valve timing signal received from the controller 140. The pushrod rotation mechanism 170 may include a rotating means 172 driven by a motor 174. The rotating means 172 may be a set of gears, such as, but not limited to, a set of bevel gears. The rotating means 172 may include a first bevel gear 176 operatively connected to an output shaft 178 of the motor 174. The first bevel gear 176 is drivably connected to a second bevel gear 180 disposed on the pushrod 162 and configured to rotate the pushrod 162. In alternative embodiments, the rotating means 172 may include other embodiments, such as, but not limited to, a belt or a chain.
The variable valve timing arrangement 150 may include a cam follower adjustment mechanism 182, as illustrated in a magnified view, the cam follower adjustment mechanism 182 may be configured to reposition the cam follower 152 based on the rotation of the pushrod 162. The cam follower adjustment mechanism 182 may include a block 184, slidably disposed on the pushrod 162. The block 184 may be fastened on the pushrod 162 via threads 186. The threads 186 on the pushrod 162 may allow the block 184 to slide up or down along the pushrod 162 based on the rotation of the pushrod 162. The sliding movement of the block 184 may control the position of the cam follower 152 attached to the tappet 160 via a linkage arm 188. The linkage arm 188 may be pivotally connected to the block 184 at a first pivot point 190. The linkage arm 188 may pivotally connected to the tappet 160 at a second pivot point 192. The block 184 may be slidably keyed into the engine block 104 to prevent rotation of the block 184 along with the pushrod 162.
Referring to
Referring to
Industrial Applicability
Varying valve timing of an engine 102 in response to or as a function of engine operating conditions and/or parameters may enable the engine 102 to operate more efficiently and/or produce less of some gaseous emissions. The variable valve timing arrangement may be used in applications such as motor vehicles, machines, locomotives or marine engines, and in stationary applications such as electrical power generators, small mechanical engines such as lawn mowers, all terrain vehicles (ATVs), generators, etc.
At step 506, the motor 174 may include a means receiving the desired timing signal from the controller 140 and driving the rotating means 172 via the output shaft 178 to rotate the pushrod 162. At step 508, the cam follower adjustment mechanism 182 including the block 184 fastened on the pushrod 162 via the threads 186 may move along the pushrod 162 based on the rotation of the pushrod 162 and reposition the cam follower 152 via a linkage arm 188. The repositioning of the cam follower 152 may selectively advance or retard opening and closing of one or more overhead intake or exhaust valves 110, 118.
The cam follower 152 may be repositioned into the advanced position (as illustrated in
From the foregoing it will be appreciated that, although specific embodiments have been described herein for purposes of illustration, various modifications or variations may be made without deviating from the spirit or scope of inventive features claimed herein. Other embodiments will be apparent to those skilled in the art from consideration of the specification and figures and practice of the arrangements disclosed herein. It is intended that the specification and disclosed examples be considered as exemplary only, with a true inventive scope and spirit being indicated by the following claims and their equivalents.
Number | Name | Date | Kind |
---|---|---|---|
3585974 | Weber | Jun 1971 | A |
5709179 | Hara et al. | Jan 1998 | A |
5992362 | Helmin | Nov 1999 | A |
6973901 | Machida | Dec 2005 | B2 |
7546823 | Buelna | Jun 2009 | B2 |
8033261 | Robbins | Oct 2011 | B1 |
8701608 | Xiong et al. | Apr 2014 | B2 |
20070199529 | Deane | Aug 2007 | A1 |
20080202455 | Diggs | Aug 2008 | A1 |
Number | Date | Country |
---|---|---|
2039892 | Mar 2009 | EP |
9421897 | Sep 1994 | WO |
2006092312 | Sep 2006 | WO |
WO 2011102253 | Aug 2011 | WO |
Number | Date | Country | |
---|---|---|---|
20140245979 A1 | Sep 2014 | US |