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KR-20260066145-A - System and method for operating an engine valve including a recompression relief valve event

KR20260066145AKR 20260066145 AKR20260066145 AKR 20260066145AKR-20260066145-A

Abstract

A valve actuation system for actuating at least one of two or more engine valves in an internal combustion engine comprises at least one motion source, including a first motion source configured to provide an exhaust main valve event. A valve train for transmitting valve events from at least one motion source to two or more engine valves comprises a loss motion component for selectively transmitting valve events to at least one of two or more engine valves. A phasing assembly is configured to advance the phase of at least the first motion source and the exhaust main valve event. At least one motion source is configured to provide a recompression relief valve event to at least one of two or more engine valves when the phase of the exhaust main valve event is advanced.

Inventors

  • 로버츠, 가브리엘 에스.
  • 맨델, 존
  • 벤너, 토마스

Assignees

  • 자콥스 비히클 시스템즈, 인코포레이티드.

Dates

Publication Date
20260512
Application Date
20241004
Priority Date
20231004

Claims (11)

  1. A system for operating at least one of two or more engine valves in an internal combustion engine, comprising at least one motion source including a first motion source configured to provide an exhaust main valve event, and a valve train for transmitting a valve event from the at least one motion source to two or more engine valves, wherein the valve train includes a loss motion component for selectively transmitting a valve event from the at least one motion source to at least one of the two or more engine valves through the valve train, and the system comprises: It includes a phasing assembly configured to advance the phase of at least the first motion source and the exhaust main valve event; A system configured such that the at least one motion source provides a recompression relief valve event to at least one of the two or more engine valves through the valve train and the at least one loss motion component when the phase of the exhaust main valve event is advanced.
  2. A system according to claim 1, wherein the recompression relief valve event is configured to overlap with the intake main valve event.
  3. A system according to claim 1, wherein the at least one motion source comprises a second motion source configured to provide the recompression relief valve event.
  4. In paragraph 3, the system is configured such that the paging assembly advances the phase of the second motion source and the recompression relief valve event.
  5. In paragraph 3, the system is configured such that the second motion source provides an auxiliary valve event.
  6. In paragraph 3, the system comprises at least one motion source including a third motion source configured to provide an auxiliary valve event.
  7. In claim 1, the system, wherein the first motion source is configured to provide the recompression relief valve event.
  8. In claim 7, the system comprises at least one motion source including a second motion source configured to provide an auxiliary valve event.
  9. In claim 8, the system is configured such that the paging assembly advances the phase of the second motion source and the auxiliary valve event.
  10. In claim 7, the system, wherein the first motion source is configured to provide an auxiliary valve event.
  11. A method for operating at least one of two or more engine valves in an internal combustion engine comprising at least one motion source including a first motion source configured to provide an exhaust main valve event, and a valve train for transmitting a valve event from the at least one motion source to two or more engine valves, wherein the valve train includes a loss motion component for selectively transmitting a valve event from the at least one motion source to at least one of the two or more engine valves through the valve train, and the method comprises: At least a step of advancing the phase of the first motion source and the exhaust main valve event; and A method comprising the step of providing a recompression relief valve event to at least one of the two or more engine valves through the valve train and the at least one loss motion component from the at least one motion source when the phase of the exhaust main valve event is advanced.

Description

System and method for operating an engine valve including a recompression relief valve event The present disclosure generally relates to a system and method for operating an engine valve, and in particular to such a system and method including a recompression relief valve event. Systems for operating one or more engine valves in an internal combustion engine are well known in the art. FIG. 1 is a partial schematic diagram of an internal combustion engine (100) including a cross-sectional view of an engine cylinder (102) and an associated valve operating system according to a conventional technique. Although FIG. 1 illustrates a single cylinder (102) for convenience of illustration, it is understood that internal combustion engines often include such multiple cylinders driving a crankshaft (not shown). The engine cylinder (102) has a piston (104) disposed inside that reciprocates up and down repeatedly during both positive power action (i.e., during the combustion of fuel to drive the piston (104) and the drive system) and auxiliary action of the cylinder (102). At the top of each cylinder (102) there may be at least one intake valve (106) and at least one exhaust valve (108). The intake valve(s) (106) and exhaust valve(s) (108) are each opened and closed to provide communication with the intake gas passage (110) and the exhaust gas passage (112). The valve actuation force for opening the intake valve (106) and the exhaust valve (108) is transmitted by the respective valve trains (114, 116). In turn, such valve actuation force (exemplified by dashed arrows) may be provided by the respective main and/or auxiliary motion sources (118, 120, 122, 124), such as rotary cams. As used herein, the predicate “main” refers to the so-called main event engine valve motion, that is, the valve motion used during positive power generation, whereas the predicate “auxiliary” refers to other engine valve motions intended for purposes other than positive power generation (e.g., compression release braking, bleeder braking, cylinder depressurization, brake gas recirculation (BGR), etc.) or for positive power generation (e.g., early exhaust valve opening (EEVO), internal exhaust gas recirculation (IEGR), variable valve actuations (VVA), Miller/Atkinson cycle, swirl control, etc.). The valve train (114, 116) may include any number of mechanical, hydraulic, hydraulic-mechanical, electromagnetic, or other types of valve train elements known in the art. For example, each of the valve train (114, 116) may include one or more cam followers, push tubes, rocker arms, valve bridges, etc., used to transmit valve operating motion to the valve (106, 108). Additionally, one or more lost motion components (126, 128) may be included in one or both of the valve trains (114, 116), thereby preventing some or all of the valve operating motion normally transmitted from the auxiliary motion source (120, 124) by the valve train (114, 116) from reaching the valve (106, 108), i.e., is lost. Although not illustrated in FIG. 1, it is known that a loss motion component is also included in the path between one or more main motion sources (118, 122) and corresponding engine valves (106, 108). Such loss motion components (126, 128) may include an element that can be selectively controlled (typically by the application or removal of hydraulic fluid) to take a contracted/compliant state in which valve actuation motion that could be transmitted by the element is avoided or absorbed, thereby losing such motion, or an extended/rigid state in which such valve actuation motion is transmitted through the element. For example, U.S. Patent No. 9,512,746 illustrates an example of an actuator piston (762) (Fig. 7) that can be hydraulically locked in an extended position or allowed to contract into a corresponding bore. As an additional example, U.S. Patent No. 9,790,824 describes a hydraulically controlled mechanical locking mechanism that is typically in a locked/non-contracted or motion-transmitting state and can be switched to an unlocked/contracted or motion-absorbing state when hydraulic fluid is applied. An internal combustion engine may utilize a cam phaser (not shown in FIG. 1), which is a variable cam timing (VCT) device that adjusts the timing (phase) of the engine camshaft relative to the engine crankshaft. Ultimately, adjusting the cam phase can change the intake and/or exhaust valve motion during engine operation, thereby providing performance and efficiency benefits. Examples of such cam phasing are illustrated in FIG. 2 and FIG. 3, where FIG. 2 illustrates typical main exhaust (540) and main intake (204) valve events (also referred to in the art as valve actuation motions). As illustrated, the main exhaust valve event (540) typically occurs between the bottom-dead center (BDC) and top-dead center (TDC) of the piston (104) during the exhaust stroke, whereas the main intake valve event (204) typically occurs between the TDC and BDC during the intake stroke.