Cylinder deactivation system

Abstract

The valve bank system may include a rocker arm assembly actuatable between: a drive mode defining a drive valve lift profile of an engine valve; and a cylinder deactivation mode defining a make-up valve lift profile of the engine valve. The make-up valve lift curve begins after the drive valve lift curve. And the replenishment lift range limited by the replenishment valve lift curve is smaller than the driving lift range. The make-up valve lift curve ends within 15% of the end of the drive valve lift curve. The make-up valve lift curve is entirely defined within the drive valve lift curve such that: when the rocker arm assembly is in the drive mode, movement of the engine valve is determined by the drive valve lift curve; when the rocker arm assembly is in the cylinder deactivation mode, the movement of the engine valve is determined by the make-up valve lift curve.

Description

Cross-reference to related applications

[0001] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 586,010, filed September 28, 2023, the entire contents of which are hereby incorporated by reference. Technical Field

[0002] This disclosure relates to engines and engine valve assembly systems. More specifically, this disclosure relates to cylinder deactivation systems for engine valve assembly systems. Summary of the Invention

[0003] In some aspects, the technology described herein relates to a valve group system comprising: a rocker arm assembly actuated between: a drive mode defining a drive valve lift curve for an engine valve; and a cylinder deactivation mode defining a replenishment valve lift curve for the engine valve; wherein the replenishment valve lift curve begins after the drive valve lift curve; wherein the replenishment valve lift curve defines a replenishment lift magnitude that is less than the drive lift magnitude; wherein the replenishment valve lift curve ends within 15% of the end of the drive valve lift curve; and wherein the replenishment valve lift curve is completely confined within the drive valve lift curve, such that: when the rocker arm assembly is in the drive mode, the movement of the engine valve is determined by the drive valve lift curve, and when the rocker arm assembly is in the cylinder deactivation mode, the movement of the engine valve is determined by the replenishment valve lift curve.

[0004] In some respects, the technology described herein relates to a valve group system in which the replenishment valve lift curve begins to open after the drive valve lift curve.

[0005] In some respects, the technology described herein relates to a valve group system in which the replenishment valve lift profile defines a replenishment valve lift duration that is shorter than the drive valve lift duration.

[0006] In some respects, the technology described herein relates to a valve group system in which the replenishment valve lift curve begins after 25% of the duration of the drive valve lift has elapsed.

[0007] In some respects, the technology described herein relates to a valve group system in which the replenishment valve lift curve begins after 40% to 75% of the duration of the drive valve lift has elapsed.

[0008] In some respects, the technology described herein relates to a valve assembly system in which the duration of the replenishment valve lift is 25% to 75% of the duration of the drive valve lift.

[0009] In some respects, the technology described herein relates to a valve group system in which the duration of the replenishment valve lift is less than 60% of the duration of the drive valve lift.

[0010] In some respects, the technology described herein relates to a valve group system in which the replenishment lift is less than 60% of the drive lift.

[0011] In some respects, the technology described herein relates to a valve group system in which the supply valve lift curve ends before the drive valve lift curve.

[0012] In some respects, the technology described herein relates to a valve group system in which the feed valve lift curve ends within 10% of the end of the drive valve lift curve.

[0013] In some respects, the technology described herein relates to a valve group system in which the feed valve lift curve ends within 5% of the end of the drive valve lift curve.

[0014] In some respects, the technology described herein relates to a valve assembly system, further comprising: an engine valve, the engine valve including an intake valve, wherein the drive valve lift profile and the replenishment valve lift profile are applied to the intake valve through the valve portion of the rocker arm assembly.

[0015] In some respects, the technology described herein relates to a valve assembly system, further comprising: a drive cam that defines the drive valve lift profile; and a replenishment cam that defines the replenishment valve lift profile.

[0016] In some respects, the technology described herein relates to a valve group system, wherein the rocker arm assembly further includes: a locking assembly; and a controller, wherein the controller includes at least one processor and a memory storing instructions thereon; the instructions, when executed by the at least one processor, cause the controller to: receive a cylinder deactivation signal; and in response to receiving the cylinder deactivation signal, control the locking assembly to disengage the drive cam and implement the cylinder deactivation mode.

[0017] In some respects, the technology described herein relates to a valve assembly system in which the feed cam is not engaged with the rocker arm assembly when the drive mode is active.

[0018] In some aspects, the technology described herein relates to an engine comprising: a plurality of cylinders, each cylinder including: a rocker arm assembly actuable between: a drive mode defining a drive valve lift curve; and a cylinder deactivation mode defining a replenishment valve lift curve; wherein the replenishment valve lift curve begins after the drive valve lift curve; wherein the replenishment valve lift curve defines a replenishment lift magnitude that is less than the drive lift magnitude; wherein the replenishment valve lift curve ends within 15% of the end of the drive valve lift curve; and wherein the replenishment valve lift curve is completely defined within the drive valve lift curve; and a controller comprising at least one processor and a memory storing instructions thereon; the instructions, when executed by the at least one processor, causing the controller to: receive a cylinder deactivation signal; and, in response to receiving the cylinder deactivation signal, activate the cylinder deactivation mode in at least one cylinder.

[0019] In some respects, the technology described herein relates to an engine in which the cylinder deactivation signal includes an identifier about which cylinders are operating in the cylinder deactivation mode.

[0020] In some respects, the technology described herein relates to an engine in which the replenishment valve lift curve begins to open after the drive valve lift curve; wherein the replenishment valve lift duration defined by the replenishment valve lift curve is less than 60% of the drive valve lift duration; wherein the replenishment lift amplitude is less than 60% of the drive lift amplitude; and wherein the replenishment valve lift curve ends before the drive valve lift curve.

[0021] In some respects, the technology described herein relates to a rocker arm assembly capable of being actuated between: a drive mode defining a drive valve lift curve; and a cylinder deactivation mode defining a replenishment valve lift curve; wherein the replenishment valve lift curve begins to open after the drive valve lift curve; wherein the replenishment valve lift duration defined by the replenishment valve lift curve is less than 60% of the drive valve lift duration; wherein the replenishment lift amplitude is less than 60% of the drive lift amplitude; and wherein the replenishment valve lift curve ends before the drive valve lift curve.

[0022] In some respects, the technology described herein relates to a rocker arm assembly in which the replenishment valve lift curve begins after 25% of the duration of the drive valve lift has elapsed; and in which the replenishment valve lift curve ends within 10% of the end of the drive valve lift curve.

[0023] This abstract is for illustrative purposes only and is not intended to be limiting in any way. Other aspects, features, and advantages of the apparatus or process described herein will become apparent when read in conjunction with the accompanying drawings, in which like reference numerals denote like elements. Attached Figure Description

[0024] The device will be described in more detail in the accompanying drawings below. These drawings are illustrative only, and some features may be used alone or in combination with other features. The drawings are not all drawn to scale.

[0025] Figure 1 This is a schematic diagram of an engine according to certain implementation schemes.

[0026] Figure 2 This is a perspective view of a rocker arm assembly according to certain implementation schemes.

[0027] Figure 3 It is based on certain implementation plans. Figure 2 A perspective view of the rocker arm assembly shown.

[0028] Figure 4 It is based on certain implementation plans. Figure 2 The rear sectional view of the rocker arm assembly shown.

[0029] Figure 5 It is based on certain implementation plans. Figure 1 The diagram shows a schematic of the engine controller.

[0030] Figure 6 It is a graph showing the active valve lift curve and the cylinder deactivation valve lift curve according to certain implementation schemes.

[0031] Figure 7 It is a graph showing the non-active valve lift curve and the cylinder deactivation valve lift curve according to certain implementation schemes. Detailed Implementation

[0032] The concepts related to engines, valve assembly systems, and rocker arm assemblies, as well as embodiments of methods, apparatus, and systems for said engines, valve assembly systems, and rocker arm assemblies, will be described in more detail below. Exemplary embodiments are illustrated in detail in the accompanying drawings, and this disclosure is not limited to the details or methods set forth in the specification or the drawings. The terminology used herein is for descriptive purposes only and should not be considered limiting.

[0033] In general, as can be seen from the accompanying drawings, the various embodiments disclosed herein relate to systems, apparatus, and methods for an auxiliary valve actuation mechanism mounted on at least one valve (e.g., an intake valve) and driven by an auxiliary cam peak having a secondary lift profile designed to always lie within the main valve lift profile. When the cylinder is in a "cylinder deactivation" (CDA) mode, the main valve lift is deactivated, and the main valve lift profile is bypassed. During CDA mode operation, the auxiliary valve actuation mechanism causes the intake valve to continue opening and closing according to the secondary valve lift profile. Compared to the main valve lift profile, the secondary lift profile defines a smaller lift amplitude and a shorter lift duration. This secondary lift profile delivers "refresh air" into the cylinder, thereby ensuring a constant volume of air is introduced into the cylinder during each stroke. During CDA mode operation, this secondary lift profile helps maintain consistent spring stiffness within the cylinder. Furthermore, during CDA mode operation, this secondary lift profile also prevents lubricating oil from seeping into the cylinder across the piston rings.

[0034] Applying cylinder pressure control (CDA) technology in engines offers numerous benefits, such as improved overall operating efficiency under low load conditions, enhanced fuel economy, and optimized exhaust aftertreatment performance. Valve assembly systems can be adapted to selectively deactivate one or more cylinders in the engine. In some implementations, CDA is applied by completely cutting off valve movement. However, stopping valve movement can introduce certain drawbacks to engine performance. For example, the lack of cylinder pressure management during CDA operation can lead to a range of adverse consequences, including harmfully low gas temperatures, lubrication system contamination, and / or reduced emissions control effectiveness. Therefore, providing systems and methods to improve cylinder pressure management in CDA mode is of significant practical importance.

[0035] In some implementations, CDA mode is applied to internal combustion engines to help improve performance (e.g., for fuel savings, increased exhaust temperature, aftertreatment thermal management, etc.). During CDA mode operation, gases are trapped inside the engine cylinders. In a typical CDA system, the pressure of the trapped gases gradually dissipates due to leaks (e.g., air escaping from the piston rings). Eventually, a negative pressure forms inside the cylinder (e.g., when the piston is near bottom dead center). This negative pressure can cause unintended oil leakage from the oil pan or intrusion into the combustion chamber defined by the cylinder and piston. Oil intrusion causes the cylinder pressure to rise at top dead center; and when CDA mode terminates and normal internal combustion resumes, this intruded oil is burned, resulting in unclean combustion.

[0036] For example, in a typical engine, during CDA operation, gas trapped in the combustion chamber 36 may drive or trigger blow-by into the crankcase, resulting in undesirable heat transfer and / or potential energy dissipation, leading to pressure decay and a drop in gas temperature. The negative pressure gradient present in the combustion chamber relative to the crankcase in a typical engine can cause undesirable oil leaks. Alone or in conjunction with this, low gas temperature can adversely affect emissions and, in extreme cases, may even cause vapor condensation and crystal formation. These phenomena may be particularly pronounced when a CDA vacuum strategy is employed (e.g., disabling the intake valves before disabling the exhaust valves). Therefore, implementing a CDA replenishment strategy (i.e., allowing a small amount of air to recharge the cylinders) would be beneficial, for example, by providing one or more relatively brief valve opening events during CDA operation. CDA mode can replenish the combustion chamber and provide pressure equalization and / or rebalancing during engine operation with CDA mode enabled.

[0037] like Figure 1 As shown, engine 20 includes cylinder 24, piston 28 adapted to and disposed within cylinder 24, cylinder head 32 enclosing cylinder 24, and combustion chamber 36 defined between cylinder 24, piston 28, and cylinder head 32. Valve assembly system 40 includes intake valve 44 and exhaust valve 48. Controller 52 is arranged to communicate with valve assembly system 40 and configured to control the operation of valve assembly system 40. Engine 20 includes multiple cylinders 24, although only one is shown in the figure. In some embodiments, engine 20 may be a six-cylinder engine, comprising more than six or fewer cylinders 24. The following description will be illustrated using a single cylinder 24 as an example, but it should be understood that the description also applies to any number of cylinders 24 in engine 20. Engine 20 falls under the category of internal combustion engines, specifically spark-ignition or compression-ignition engines.

[0038] In some embodiments, the controller 52 is configured to selectively implement the CDA mode. In some embodiments, when the CDA mode is enabled during engine operation, the gas (e.g., air) remaining inside the cylinder 24 may consume work and / or dissipate energy.

[0039] In some embodiments, valve group system 40 includes a rocker arm assembly that allows for the implementation of CDA mode. While this disclosure may describe specific types of valve group architectures and / or switchable rocker arm designs to facilitate understanding, it should be understood that this disclosure covers any valve group architecture and / or switchable rocker arm design suitable for implementing CDA mode. By way of example and not limitation, the systems and methods described herein are applicable to any suitable valve group architecture (e.g., type I to type V), and any suitable combinations and variations of such architectures are fully covered herein.

[0040] The systems and methods described herein are applicable to a variety of switching mechanisms and / or actuation methods to achieve switchable rocker arm systems and / or switchable tripping mechanisms. In some embodiments, the hydraulically driven actuation system described herein as a non-limiting example may be supplemented or replaced by an electrically or electromagnetically driven actuation system (e.g., utilizing a solenoid). In some embodiments, the valve lift profile may be directly transmitted from the cam to the rocker arm assembly, for example, via a roller mechanism. In some embodiments, the valve lift profile may be indirectly transmitted to the rocker arm assembly, for example, via a pushrod mechanism, and / or via a hydraulic valve clearance adjuster or other mechanism.

[0041] By way of example and not limitation, foldable and / or retractable systems, capsule-based systems, and / or other release mechanisms, with or without springs, may be employed. By way of example and not limitation, locking mechanisms comprising one or more pins may be employed. In some embodiments, one or more pins in the locking mechanism employed herein may be subjected to biasing forces in one or more directions, respectively.

[0042] In some embodiments, systems and methods are disclosed herein that allow one or more valves to be opened for replenishment when a CDA mode is enabled. In some embodiments, the one or more valves applicable to the CDA mode may be intake valves (e.g., intake valve 44), exhaust valves (e.g., exhaust valve 48), or a combination of both. In some embodiments (which will be further detailed below), when an operating mode (e.g., a drive mode) is enabled and that mode includes disabling cylinder deactivation (i.e., not including a CDA mode), the rocker arm assembly transfers standard or drive valve lift from the drive cam to one or more valves, thereby enabling drive mode operation without cylinder activation. In contrast, in some embodiments, when a CDA mode is enabled, the standard or drive valve event is canceled; instead, the rocker arm assembly transfers replenishment valve lift from the replenishment cam to one or more valves, thereby providing a cylinder activation mode that includes replenishment functionality.

[0043] like Figure 2As shown, the rocker arm assembly 110 rotates about a rocker arm shaft passing through the rocker arm shaft bore 120. In some embodiments, the rocker arm assembly 110 includes a valve portion 130 that engages with one or more valves (e.g., intake valve 44) of the cylinder 24. In some embodiments, the valve portion 130 includes a suitable interface structure for direct or indirect engagement with the intake valve 44, such as an E-foot 135. In some embodiments, the valve portion 130 engages with multiple valves, for example via a valve bridge 138. In some embodiments, the valve portion 130 may include one or more switchable components, such as a retractable and / or extendable bladder assembly.

[0044] In some embodiments, the rocker arm assembly 110 may include a rocker arm portion configured to receive one or more valve lift profiles, such as directly or indirectly receiving lift profiles from one or more cams. In some embodiments, the rocker arm portion includes a drive cam portion 140 including drive rollers 150 capable of directly engaging a drive cam 170. In some embodiments, the rocker arm portion further includes a replenishment cam portion 145 including replenishment rollers 160 capable of directly engaging a replenishment cam 180. In some embodiments, the drive cam 170 and the replenishment cam 180 are disposed on a camshaft 190. In some embodiments, separate cams configured to interface with the rocker arm assembly 110 may be disposed on separate camshafts. In some embodiments, the replenishment cam portion 145 is rigidly coupled to the valve portion 130, thereby allowing both to rotate as a single unit about the rocker arm axis of the valve assembly system 40.

[0045] like Figure 3 As shown, the rocker arm assembly 110 includes switchable mechanisms that selectively transmit, modify, and / or absorb one or more portions of one or more valve lift profiles received by the rocker arm assembly 110 (e.g., received via drive cam 170 and / or feed cam 180). For example, the drive cam portion 140 of the rocker arm assembly 110 includes a release assembly 200 and a switchable latch assembly 400. In some embodiments, the latch assembly 400 may be hydraulically actuated, for example, based on receiving pressurized hydraulic fluid. Alternatively or supplementally, in some embodiments, the latch assembly 400 may also be electrically or electromagnetically actuated, for example, via a solenoid.

[0046] In some embodiments, the slip-off assembly 200 includes one or more systems configured to absorb displacement and / or motion. For example, the slip-off mechanism 200 includes a slip-off spring 210 capable of absorbing valve lift from the drive cam 170, such as through compression based on received forces, displacements, and / or energy associated with the cam valve lift. In some embodiments, the slip-off spring 210 is supported by a slip-off support member 220 (see [link to documentation]). Figure 4 In some embodiments, the trip mechanism 200 is secured to and / or supported by one or more connecting components to other portions of the rocker arm assembly 110. In some embodiments, a first connector 230 connects the trip mechanism 200 to the valve portion 130. In some embodiments, a second connector 240 connects the trip mechanism 200 to the drive cam portion 140. Although specific features of a particular trip mechanism (e.g., trip mechanism 200) are described and / or illustrated herein to aid better understanding, this disclosure fully covers other suitable forms and features of switchable mechanisms. For example (but not limited to), switchable components may be provided and combined with the trip mechanism 200 to selectively enable or disable the operation of the trip mechanism 200.

[0047] like Figure 4 As shown, the locking assembly 400 selectively engages with the drive cam portion 140 to transmit the drive valve lift profile received from the drive cam 170 to the valve portion 130, and / or enables the drive cam portion 140 to rotate about the rocker arm axis as a whole with the rest of the rocker arm assembly 110. Therefore, in some embodiments, the locking assembly 400 disengages the drive cam portion 140, thereby enabling the release mechanism 200 to absorb the drive valve lift profile received by the drive cam portion 140 from the drive cam 170, and / or otherwise prevent the transmission of the received drive valve lift to the valve portion 130 of the rocker arm assembly 110.

[0048] In some embodiments, the locking assembly 400 includes a locking bore 410 comprising a plurality of apertures disposed on a plurality of portions of the rocker arm assembly 110. In some embodiments, the locking bore 410 is at least partially disposed within the drive roller 150 of the drive cam portion 140. In some embodiments, one or more locking pins of the locking assembly 400 may be in a locked or unlocked state, thereby enabling selective transmission of the drive valve lift profile received from the drive cam 170 to the valve portion 130 of the rocker arm assembly 110. In some embodiments, one or more locking pins (e.g., locking pin 430) are slidably disposed within the locking bore 410 such that axial movement along the locking bore 410 can rotatably engage or disengage the drive cam portion 140, thereby enabling it to rotate relative to the valve portion 130—for example, about a rocker arm shaft disposed within the rocker arm shaft bore 120. In some embodiments, to achieve selective locking of the locking assembly 400, one or more locking pins selectively slide into, extend into, and / or disengage from a portion of a locking bore 410 within the drive cam portion 140. In some embodiments, one or more axial ends of the locking bore 410 include a biasing member 450 and a support pin 445.

[0049] In some embodiments, actuation of the locking assembly 400 is based on a differential action that depends on relative forces applied from multiple sides. For example, when actuated or energized, piston 440 can move axially to the right (in... Figure 4 (In the reference frame shown), and / or, when de-actuated or de-energized, it resets axially to the left based on the reset force applied by the bias member 450. In some embodiments, the piston 440 can achieve selective movement or translation by selectively pressurizing a chamber, for example by delivering hydraulic fluid via hydraulic port 470. In some embodiments, when the hydraulic chamber end cap 480 is removed, the hydraulic port 470 is fluidly connected to a controlled source of pressurized hydraulic fluid via hydraulic passage 475. In some embodiments, a solenoid-based oil control valve (OCV) can be used to selectively pressurize the hydraulic lines leading to the locking assembly 400, for example, through the rocker arm shaft bore 120.

[0050] For reference Figure 5 The diagram illustrates a controller 52 according to an exemplary embodiment. Figure 5As shown, controller 52 includes: processing circuitry 54, which includes processor 56 and memory device 58; control system 60, which includes drive mode circuitry 62 and CDA mode circuitry 64; and communication interface 66. Typically, controller 52 is configured to operate cylinders 24 of engine 20 in drive mode and CDA mode. In some embodiments, controller 52 is configured to determine when to implement CDA mode and on how many cylinders 24 of engine 20. In some embodiments, the feed roller 160 is always engaged with the feed cam 180, while controller 52 selectively implements drive mode by engaging drive roller 150 with drive cam 170. In other words, when drive roller 150 is actuated to not engage with drive cam 170, CDA mode is active and cylinders 24 are deactivated. In some embodiments, controller 52 is an engine control unit (ECU) or other vehicle controller.

[0051] In one configuration, the circuitry of the control system 60 exists in the form of a machine-readable or computer-readable medium executable by a processor (e.g., processor 56). This machine-readable medium facilitates the performance of operations, enabling the reception and transmission of data. For example, the machine-readable medium may provide instructions (e.g., commands, etc.) for acquiring data. The computer-readable program code may execute on a single processor, multiple processors located in the same location, multiple remote processors, or any combination of local and remote processors. Remote processors may be interconnected via any type of network (e.g., CAN bus, etc.).

[0052] In another configuration, the circuitry of control system 60 is implemented as a hardware unit, such as an electronic control unit. Therefore, the circuitry of control system 60 can be implemented as one or more circuit system components, including but not limited to processing circuitry, network interfaces, peripherals, input devices, output devices, sensors, etc. In some embodiments, the circuitry of control system 60 may take the form of one or more analog circuits, electronic circuits (e.g., integrated circuits (ICs), discrete circuits, system-on-a-chip (SoC) circuits, microcontrollers, etc.), telecommunication circuits, hybrid circuits, and any other type of "circuit". For example, the circuitry described herein may include one or more transistors, logic gates (e.g., NAND, AND, NOR, OR, XOR, NOT, XNOR, etc.), resistors, multiplexers, registers, capacitors, inductors, diodes, wiring, etc. The circuitry of control system 60 may also include programmable hardware devices, such as field-programmable gate arrays (FPGAs), programmable array logic (PALs), programmable logic devices, or similar devices. The circuitry of control system 60 may include one or more memory devices for storing instructions executable by a processor in the circuitry of control system 60. In some hardware unit configurations, the circuitry of control system 60 may be geographically distributed across different locations. Alternatively, and as shown in the figure, the circuitry of the control system 60 may be implemented within or in a single unit / housing, which is shown as controller 52.

[0053] In the illustrated example, controller 52 includes processing circuitry 54, which includes a processor 56 and a memory device 58. Processing circuitry 54 may be constructed or configured to execute or implement the instructions, commands, and / or control processes described herein with respect to the circuitry of control system 60. The configuration shown in the figures represents the circuitry of control system 60 as a machine-readable or computer-readable medium. However, as stated above, this illustration is not intended to be limiting, as other embodiments are contemplated in this disclosure where the circuitry of control system 60, or at least one circuit within the circuitry of control system 60, is configured as a hardware unit. All such combinations and variations are intended to fall within the scope of this disclosure.

[0054] Hardware and data processing components (e.g., processor 56) used to implement the various processes, operations, exemplary logic, logic blocks, modules, and circuits described in conjunction with the embodiments disclosed herein may be implemented or performed by a general-purpose single-chip or multi-chip processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate circuits or transistor logic, discrete hardware components, or any combination of the above components designed to perform the functions described herein. The general-purpose processor may be a microprocessor, or any conventional processor or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a combination of multiple microprocessors, a combination of one or more microprocessors with a DSP core, or any other such configuration.

[0055] Memory device 58 (e.g., memory, memory cell, storage device) may include one or more devices (e.g., RAM, ROM, flash memory, hard disk storage) for storing data and / or computer code to perform or assist the various processes, hierarchies, and modules disclosed herein. Memory device 58 may be communicatively connected to processor 56 to provide computer code or instructions to processor 56 for executing at least some of the processes described herein. Furthermore, memory device 58 may be or include tangible, non-transient volatile memory or non-volatile memory. Therefore, memory device 58 may include database components, object code components, script components, or any other type of information structure to support the various activities and information structures described herein.

[0056] Drive mode circuit 62 is configured to receive drive mode signals (e.g., in response to a power demand requiring activation of cylinder 24). Drive mode circuit 62 determines a drive valve lift profile based on the received drive mode signal. In some embodiments, the drive valve lift profile is retrieved from a lookup table stored in memory device 58. For example, this drive valve lift profile may depend on the power or performance requirements of engine 20 and may vary depending on the specific requirements of engine 20 (e.g., coordination with spark timing circuit, efficiency requirements, engine drag conditions, etc.). In some embodiments, the drive valve lift profile is determined internally by drive mode circuit 62 or is defined as a constant profile. Drive mode circuit 62 is also configured to control locking assembly 400 in rocker arm assembly 110 via communication interface 66. When a drive mode signal is received, drive mode circuit 62 provides information to locking assembly 400, thereby positioning drive roller 150 and engaging drive cam 170, which in turn determines the position of valve (e.g., intake valve 44) based on the drive valve lift profile. In some implementations, the drive mode is controlled by a different structure, while the valve lift mechanism is controlled by the drive mode circuit 62 to enable or disable the drive mode.

[0057] CDA mode circuit 64 is configured to receive CDA mode signals (e.g., in response to needs for increased efficiency, increased exhaust temperature, etc.). CDA mode circuit 64 is also configured to control locking component 400 in rocker arm assembly 110 via communication interface 66. Upon receiving a CDA mode signal, CDA mode circuit 64 provides information to locking component 400, causing drive roller 150 to disengage from drive cam 170, so that valve portion 130 no longer moves according to the drive valve lift curve. In some embodiments, the replenishment valve lift curve is defined by replenishment cam 180, and replenishment roller 160 is arranged to maintain a constant active relationship with replenishment cam 180, so that the replenishment valve lift curve is always active, even when the drive mode is active. In some embodiments, CDA mode circuit 64 can control the replenishment valve lift curve, and during CDA mode operation, different valve control structures (e.g., intake valve 44) can be used to control the valve.

[0058] although Figure 5 Various circuits with specific functions have been shown, but it should be understood that controller 52 may include any number of circuits to perform the functions described herein. For example, the activities and functions of the circuits in control system 60 may be combined into multiple circuits or implemented as a single circuit. Furthermore, additional circuits with additional functions may be included. Moreover, controller 52 may also control other activities beyond the scope of this disclosure.

[0059] As described above, in one configuration, the "circuit" can be implemented on a machine-readable medium so that it can be processed by various types of processors (e.g., Figure 5 The processor 56 in the system executes the code. For example, the identified circuit, consisting of executable code, may include one or more physical or logical blocks of computer instructions, which may be organized, for example, as objects, procedures, or functions. Nevertheless, the executable code of the identified circuit does not need to be centrally located physically, but may include discrete instructions stored in different locations. When these instructions are logically combined, they constitute the circuit and achieve its intended purpose. In fact, a circuit consisting of computer-readable program code can be a single instruction, multiple instructions, or even distributed across several different code segments, different programs, and multiple memory devices. Similarly, this document identifies and presents operational data within the circuit, which can be implemented in any suitable form and organized in any suitable type of data structure. The operational data may be aggregated as a single dataset, or it may be distributed across different locations (including different storage devices), and the operational data may exist in the system or network, at least in part, solely in the form of electronic signals.

[0060] like Figure 6 As shown, the operation of cylinder 24 in drive mode includes active control via drive mode circuit 62, causing intake valve 44 to be lifted according to drive valve lift curve 500. Supply valve lift curve 504 is completely confined within drive valve lift curve 500. In other words, when drive mode is active, drive roller 150 engages with drive cam 170, while supply roller 160 does not engage with supply cam 180. All movement of the valve (e.g., intake valve 44) is determined by drive valve lift curve 500 (e.g., the shape of drive cam 170).

[0061] like Figure 7 As shown, when the drive mode is disabled and the CDA mode is active, the drive valve lift curve 500 no longer functions (e.g., the locking assembly 400 disengages the drive roller 150 from the drive cam 170). With the drive valve lift curve 500 disabled, the supply cam 180 engages with the supply roller 160, at which point the supply valve lift curve 504 becomes active and determines the movement of the valve (e.g., the intake valve 44).

[0062] In some embodiments, as the cam angle increases, the replenishment valve lift curve 504 begins to open after the drive valve lift curve 500. In some embodiments, the replenishment valve lift curve 504 begins after 25% of the drive valve lift duration has elapsed. In some embodiments, the replenishment valve lift curve 504 begins after 40% to 75% of the drive valve lift duration has elapsed.

[0063] In some embodiments, the replenishment valve lift curve 504 defines a replenishment valve lift duration that is shorter than the drive valve lift duration. In some embodiments, the replenishment valve lift duration is 25% to 75% of the drive valve lift duration. In some embodiments, the replenishment valve lift duration is less than 60% of the drive valve lift duration. In some embodiments, the replenishment valve lift duration is less than 50% of the drive valve lift duration.

[0064] In some embodiments, the replenishment valve lift profile 504 defines a replenishment lift magnitude that is smaller than the drive lift magnitude of the drive valve lift profile 500. In some embodiments, the replenishment lift magnitude is less than 60% of the drive lift magnitude. In some embodiments, the replenishment lift magnitude is less than 50% of the drive lift magnitude. In some embodiments, the replenishment lift magnitude is less than 25% of the drive lift magnitude.

[0065] In some embodiments, the replenishment valve lift curve 504 ends before the end of the drive valve lift curve 500. In some embodiments, the replenishment valve lift curve 504 ends within 5% of the end of the drive valve lift curve 500. In some embodiments, the replenishment valve lift curve 504 ends within 10% of the end of the drive valve lift curve 500. In some embodiments, the replenishment valve lift curve 504 ends within 15% of the end of the drive valve lift curve 500.

[0066] In some implementations, the replenishment valve lift curve 504 is entirely confined within the drive valve lift curve 500. In other words, the entire replenishment valve lift curve 504 is confined within the drive valve lift curve 500.

[0067] It should be understood that Figure 6 and Figure 7The forms of the drive valve lift curve 500 and / or replenishment valve lift curve 504 depicted herein are merely illustrative and not limiting, and are included to aid in better understanding. As an example only and not a limitation, either or both of the drive valve lift curve 500 or the replenishment valve lift curve 504 may include different shapes (e.g., having multiple peaks), and / or may be positioned differently along the valve lift axis or cam angle axis. Such variations and other variations are fully covered by this disclosure.

[0068] For the purposes of this specification, certain advantages and novel features of various aspects and configurations of this disclosure are described herein. The described methods, systems, and apparatuses should not be considered limiting in any way. Rather, this disclosure is intended to cover all novel and non-obvious features and aspects of the disclosed aspects, whether they exist individually or in various combinations and sub-combinations. The disclosed methods, systems, and apparatuses are not limited to any particular aspect, feature, or combination thereof; similarly, the disclosed methods, systems, and apparatuses are not required to possess any one or more particular advantages, nor are they required to solve any particular problem.

[0069] Although the accompanying drawings and specifications may show a specific order of method steps, the order of these steps may differ from the order depicted and described unless otherwise stated above. Furthermore, unless otherwise stated above, two or more steps may be performed concurrently or partially concurrently. Such variations may depend on, for example, the hardware and software system chosen and the designer's selection. All such variations are within the scope of this disclosure. Similarly, the software implementation of the method can be accomplished using standard programming techniques, combined with rule-based logic and other logic, to implement various connection steps, processing steps, comparison steps, and decision steps.

[0070] The features disclosed in this specification (including any appended claims, abstract, and drawings), and / or all steps of any method or process so disclosed, may be combined in any combination, except for combinations in which at least some of such features and / or steps are mutually exclusive. The claimed features cover any novel feature or any novel combination of features disclosed in this specification (including any appended claims, abstract, and drawings), or any novel step or any novel combination of steps in any method or process so disclosed.

[0071] As used herein and in the appended claims, the singular terms “a,” “an,” and “the” include plural references unless the context clearly specifies otherwise. A range herein may be expressed as beginning “about” a particular value and / or ending “about” another particular value. When such ranges are expressed, another aspect of this disclosure covers the case where the range begins at that particular value and / or ends at that other particular value. Similarly, when numerical values ​​are expressed as approximate values ​​using the prefix “about,” it should be understood that the particular value itself constitutes another aspect of this disclosure. It should also be further understood that the endpoints of each range are significant not only relative to the other endpoint but also independently of the other endpoint. The terms “about” and “approximate” are defined as “close to” and their meaning should be as understood by one of ordinary skill in the art. In one non-limiting aspect, these terms are defined as within 10%. In another non-limiting aspect, these terms are defined as within 5%. In yet another non-limiting aspect, the relevant terms are defined as within 1%.

[0072] As used herein, the terms “connection,” “joint,” and similar terms mean that two components are joined together directly or indirectly. Such a joint can be fixed (e.g., permanent) or movable (e.g., detachable or releasable). Such a joint can be achieved by the two components (or the two components and any additional intermediate components) being integrally formed into a single whole; or by the two components (or the two components and any additional intermediate components) being attached to each other. If “connection” or its variations are modified by an additional term (e.g., “direct connection”), the above general definition of “connection” will be modified according to the literal meaning of that additional term (e.g., “direct connection” means a joint between two components without any independent intermediate components), thus forming a narrower definition than the general definition of “connection” provided above. Such a joint can be mechanical, electrical, or fluid. For example, circuit A being “connected” to circuit B in communication may mean that circuit A communicates directly with circuit B (i.e., without an intermediate medium) or indirectly with circuit B (e.g., through one or more intermediate media).

[0073] Certain terms used in the following description are for convenience only and are not restrictive. The terms “right,” “left,” “down,” and “up” are used to refer to directions in the referenced figures. The terms “inside” and “outside” refer to directions toward and away from the geometric center of the described feature or device, respectively. The terms “distal” and “proximal” refer to directions determined in the context of the described item; with respect to the apparatus described herein, these terms are generally determined from the perspective of a practitioner using the apparatus, where “proximal” refers to a position closer to the practitioner and “distal” refers to a position farther from the practitioner. Terms include the listed vocabulary, its derivatives, and words with similar meanings.

[0074] Throughout the description and claims of this specification, the word "comprise" and variations thereof (e.g., "comprising" and "comprises") mean "including but not limited to" and are not intended to exclude, for example, other additives, components, elements, or steps. "Exemplary" means "as an example" and is not intended to convey that it is a preferred or ideal aspect. "Such as" is not used in a limiting sense but is used for illustrative purposes only.

[0075] The structures, materials, actions, and equivalents corresponding to all "means plus function" or "steps plus function" elements in the following claims are intended to cover any structure, material, or action that can be combined with other claimed elements, such as those specifically claimed, to achieve a particular function. The description of this disclosure is for illustrative and elucidating purposes and is not intended to be exhaustive or limited to all details disclosed. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of this disclosure.

Claims

1. A valve assembly system, comprising: The rocker arm assembly is actuable between the following modes: Drive mode, which defines the drive valve lift curve of the engine valves, and Cylinder deactivation mode, which defines the valve lift curve of the engine valve supply valve. The replenishment valve lift curve begins after the drive valve lift curve. The replenishment valve lift curve defines the replenishment lift range, which is less than the drive lift range. Wherein, the replenishment valve lift curve ends within 15% of the end of the drive valve lift curve, and Wherein, the replenishment valve lift curve is completely confined within the drive valve lift curve, thereby ensuring that: When the rocker arm assembly is in the drive mode, the movement of the engine valve is determined by the drive valve lift curve, and When the rocker arm assembly is in the cylinder deactivation mode, the movement of the engine valve is determined by the replenishment valve lift curve.

2. The valve assembly system according to claim 1, wherein, The replenishment valve lift curve begins to open after the drive valve lift curve.

3. The valve assembly system according to claim 1, wherein, The replenishment valve lift curve defines a replenishment valve lift duration that is shorter than the drive valve lift duration.

4. The valve assembly system according to claim 3, wherein, The replenishment valve lift curve begins after 25% of the drive valve lift duration has elapsed.

5. The valve assembly system according to claim 3, wherein, The replenishment valve lift curve begins after 40% to 75% of the drive valve lift duration has elapsed.

6. The valve assembly system according to claim 3, wherein, The duration of the replenishment valve lift is 25% to 75% of the duration of the drive valve lift.

7. The valve assembly system according to claim 3, wherein, The duration of the replenishment valve lift is less than 60% of the duration of the drive valve lift.

8. The valve assembly system according to claim 1, wherein, The refueling lift is less than 60% of the drive lift.

9. The valve assembly system according to claim 1, wherein, The replenishment valve lift curve ends before the drive valve lift curve.

10. The valve assembly system according to claim 1, wherein, The replenishment valve lift curve ends within 10% of the end of the drive valve lift curve.

11. The valve assembly system according to claim 1, wherein, The replenishment valve lift curve ends within 5% of the end of the drive valve lift curve.

12. The valve assembly system according to claim 1, further comprising: An engine valve, including an intake valve, wherein the drive valve lift curve and the replenishment valve lift curve are applied to the intake valve through the valve portion of the rocker arm assembly.

13. The valve assembly system according to claim 1, further comprising: A drive cam that defines the drive valve lift profile; as well as A replenishment cam that defines the replenishment valve lift profile.

14. The valve assembly system according to claim 13, wherein, The rocker arm assembly further includes: Locking components; and A controller, wherein the controller includes at least one processor and a memory storing instructions thereon, the instructions, when executed by the at least one processor, causing the controller to: Receive cylinder deactivation signal; and In response to receiving the cylinder deactivation signal, the locking assembly is controlled to disengage the drive cam and implement the cylinder deactivation mode.

15. The valve assembly system according to claim 13, wherein, When the drive mode is active, the supply cam is not engaged with the rocker arm assembly.

16. An engine comprising: Multiple cylinders, each cylinder including: The rocker arm assembly is actuable between the following modes: Drive mode, which defines the drive valve lift curve, and The cylinder deactivation mode limits the fill valve lift curve. The replenishment valve lift curve begins after the drive valve lift curve. The replenishment valve lift curve defines the replenishment lift range, which is less than the drive lift range. Wherein, the replenishment valve lift curve ends within 15% of the end of the drive valve lift curve, and Wherein, the replenishment valve lift curve is completely confined within the drive valve lift curve; and A controller, wherein the controller includes at least one processor and a memory storing instructions thereon; the instructions, when executed by the at least one processor, cause the controller to: Receive cylinder deactivation signal; and In response to receiving the cylinder deactivation signal, the cylinder deactivation mode is activated in at least one cylinder.

17. The engine according to claim 16, wherein, The cylinder deactivation signal includes an identifier of which cylinders are operating in the cylinder deactivation mode.

18. The engine according to claim 16, wherein, The replenishment valve lift curve begins to open after the drive valve lift curve; Wherein, the duration of the replenishment valve lift defined by the replenishment valve lift curve is less than 60% of the duration of the drive valve lift; Wherein, the replenishment lift is less than 60% of the drive lift; and The replenishment valve lift curve ends before the drive valve lift curve.

19. A rocker arm assembly capable of being actuated between the following modes: Drive mode, which defines the drive valve lift curve; and Cylinder deactivation mode, which limits the fill valve lift curve; in, The replenishment valve lift curve begins to open after the drive valve lift curve; Wherein, the duration of the replenishment valve lift defined by the replenishment valve lift curve is less than 60% of the duration of the drive valve lift; Among them, the refueling range is less than 60% of the driving range; and The replenishment valve lift curve ends before the drive valve lift curve.

20. The rocker arm assembly according to claim 19, wherein, The replenishment valve lift curve begins after 25% of the drive valve lift duration has elapsed; and The replenishment valve lift curve ends within 10% of the end of the drive valve lift curve.

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