Medium pressure accumulator with fast fill supply valve and brake system using same

An accumulator assembly, comprising:

• a medium pressure accumulator, including
• an MPA cavity including at least one brake-side passage adjacent a first end thereof and including at least one pump-side passage adjacent the first end thereof,
• an MPA piston for reciprocal longitudinal motion within the MPA cavity responsive to a predetermined amount of hydraulic fluid flow through at least one of the pump-side passage and the brake-side passage, and
• an MPA biasing spring for urging the MPA piston toward the first end of the MPA cavity;
• a nonpowered MPA fill valve interposed fluidically between the pump-side passage of the MPA cavity and a source of pressurized hydraulic fluid, the MPA fill valve including
• an MPA fill valve cavity placing the pump-side passage of the MPA cavity and the source of pressurized hydraulic fluid in selective fluid communication via an MPA fill valve fluid path,
• an MPA fill valve poppet configured for reciprocal motion within the MPA fill valve cavity, the MPA fill valve poppet including a poppet bore in direct fluid communication with the MPA cavity and in indirect fluid communication, via at least one poppet orifice extending laterally through at least a portion of the MPA fill valve poppet body, with the source of pressurized fluid,
• an MPA lip seal circumferentially surrounding at least a portion of the MPA fill valve poppet and selectively permitting fluid flow therepast along the MPA fill valve fluid path under pressure from the source of pressurized hydraulic fluid, the portion of the MPA fill valve poppet body through which the at least one poppet orifice extends selectively reciprocating longitudinally past the MPA lip seal,
• an MPA fill valve biasing spring urging the MPA fill valve poppet toward the MPA cavity, the MPA fill valve poppet selectively reciprocating responsive to at least one of biasing force from the MPA fill valve biasing spring and a fluid pressure differential between the source of pressurized hydraulic fluid and the MPA cavity;
• a powered MPA one-way valve interposed fluidically between the brake-side passage of the MPA cavity and the at least one corresponding wheel brake, the MPA one-way valve including
• an MPA one-way valve cavity placing the brake-side passage of the MPA cavity and the at least one corresponding wheel brake in selective fluid communication via an MPA one-way valve fluid path,
• an MPA one-way valve seat located along the MPA one-way valve fluid path and defined by an interior wall of the MPA one-way valve cavity,
• an MPA one-way valve poppet configured for reciprocal motion between a poppet open position and a poppet closed position wherein an MPA one-way valve poppet shoulder selectively contacts the MPA one-way valve seat to occlude fluid flow therepast along the MPA one-way valve fluid path;
• and
• an MPA check valve interposed fluidically between the brake-side passage of the MPA cavity and the at least one corresponding wheel brake, the MPA check valve including an MPA check valve seat and an MPA check valve ball spring-biased toward occlusive contact with the MPA check valve seat, the MPA check valve preventing fluid flow therepast from the at least one corresponding wheel brake toward the MPA cavity along the MPA one-way valve fluid path at least partially responsive to a cracking fluid pressure differential along the MPA one-way valve fluid path.