US 11,668,268 B2
Magnetically latching valve for fuel vapor management systems and systems incorporating same
Kevin W. Lucka, Southfield, MI (US); Matthew C. Gilmer, South Lyon, MI (US); Donald P. Tinsley, III, Huntington Woods, MI (US); and David Snow, Redford, MI (US)
Assigned to Dayco IP Holdings, LLC, Roseville, MI (US)
Filed by DAYCO IP HOLDINGS, LLC, Roseville, MI (US)
Filed on Dec. 31, 2021, as Appl. No. 17/566,785.
Claims priority of provisional application 63/161,494, filed on Mar. 16, 2021.
Claims priority of provisional application 63/133,313, filed on Jan. 2, 2021.
Prior Publication US 2022/0213850 A1, Jul. 7, 2022
Int. Cl. F02M 25/08 (2006.01); F02M 35/10 (2006.01); F16K 31/06 (2006.01); F16K 31/08 (2006.01)
CPC F02M 25/0836 (2013.01) [F02M 35/10222 (2013.01); F16K 31/0655 (2013.01); F16K 31/082 (2013.01); F02M 2025/0845 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A magnetic latching valve of a vehicle engine comprising:
a housing having an inlet port and an outlet port solely in controlled fluid communication with one another; wherein the housing encloses:
a linearly translatable armature seated within a solenoid and connected to a primary poppet valve; wherein the armature is movable between a fully open position and a closed position, respectively, after a pulse of voltage to the solenoid and is in an unpowered state thereafter;
a permanent magnet fixedly seated within the housing in a position to magnetically latch the armature in the fully open position after one pulse of voltage to the solenoid moves the armature to the fully open position for primary flow from the first port to the second port;
a primary spring seated against a primary poppet plug of the primary poppet valve, wherein the primary spring biases the primary poppet plug to a closed position when the armature is in the closed position and has a pre-selected spring rate that mechanically relieves pressure by opening the primary poppet valve a distance less than the fully open position when the spring force is exceeded, thereby also allowing flow in the primary flow direction;
wherein the primary poppet plug comprises a body shaft, a seal face, a fluid passageway therethrough having an entrance in the body shaft and an exit in the seal face, and a first spring retention feature inside the body shaft;
a tension spring operatively connected to the spring retention feature; and
a secondary poppet plug having a second spring retention feature operatively connected to the tension spring, wherein the tension spring applies a pull force to the secondary poppet plug, thereby holding the secondary poppet plug closed against the seal face of the primary poppet plug;
wherein the tension spring has a spring rate pre-selected to mechanically relieve pressure by opening the secondary poppet plug while the primary poppet valve is closed when a pressure differential is present relative to the first port and the second port that overcomes the pull force applied by the tension spring.