Patent ID: 6109300
Filing Date: 2000-08-29
Classification: F16K,G05D,Y10T

Abstract:
A fluid control device for an electronic transmission, comprising:a housing having a plurality of chambers, each chamber having at least one fluid supply port, at least one control port, and at least one exhaust port,a plurality of movable transmission spool valves disposed in said housing with a respective transmission spool valve disposed in a respective chamber, each said transmission spool valve having first and second ends and a fluid metering region between said ends and proximate said at least one control port,means disposed in each chamber proximate said second end of each said transmission spool for biasing each said transmission spool valve in a first direction,said at least one fluid supply port being disposed in said housing for applying fluid at supply pressure at said first end of each said transmission spool valve in a second direction against said bias in said first direction,a plurality of proportional variable force solenoid fluid control valves disposed in said housing with each fluid control valve received in a respective chamber at said first end of each said transmission spool valve for regulating fluid pressure at said first end in linear proportion to an electrical current signal, each said fluid control valve having a single valve seat relative to which an armature-controlled valve is movable in linear proportion to said electrical current signal to exhaust supply pressure to directly regulate said fluid pressure at said first end of each said transmission spool valve, andeach said fluid control valve receiving an electrical current signal representative of a particular shifting point of gears of said electronic transmission to regulate fluid pressure applied at said first end of each said transmission spool valve by diverting fluid to a respective said at least one exhaust port so as to cause each said transmission spool valve to move relative to a respective said at least one control port in proportion to the current level of said electrical current signal to regulate fluid pressure thereat in a manner to smooth shifting of the gears of the electronic transmission at a respective shifting point.