초록 ▼

A pressure control valve for use in an automobile braking system includes a spool slidably movable for providing selective fluid communication between a pressure fluid source, a wheel cylinder, and a reservoir. The spool has, or is associated with, a pressure-bearing member responsive to a fluid pre

A pressure control valve for use in an automobile braking system includes a spool slidably movable for providing selective fluid communication between a pressure fluid source, a wheel cylinder, and a reservoir. The spool has, or is associated with, a pressure-bearing member responsive to a fluid pressure from the wheel cylinder, for applying a first biasing force to the slidable member to urge the slidable member to a position in which the wheel cylinder and the reservoir communicates with each other. An electromagnetic coil responds to an electric signal for generating an electromagnetic force to urge the slidable member to the above position. The slidable member is normally biased by a spring under a second biasing force, greater than the first biasing force, to urge the slidable member to a position in which the pressure fluid source and the wheel cylinder communicate with each other. The fluid pressure in the wheel cylinder is regulated to cause the sum of the fluid pressure in the wheel cylinder and the electromagnetic force from the electromagnetic coil to counterbalance the second biasing force.

대표청구항 ▼

A pressure control valve for use in an automobile braking system having a pressure fluid source, a wheel cylinder, and a reservoir, said pressure control valve comprising: a slidable member slidably movable from a first position in which the pressure fluid source and the wheel cylinder communicate w

A pressure control valve for use in an automobile braking system having a pressure fluid source, a wheel cylinder, and a reservoir, said pressure control valve comprising: a slidable member slidably movable from a first position in which the pressure fluid source and the wheel cylinder communicate with each other through the slidable member for introducing a pressure fluid from the pressure fluid source into the wheel cylinder, through a second position in which the slidably member holds a fluid pressure in the wheel cylinder, to a third position in which the wheel cylinder communicates with the reservoir through the slidable member for discharging the pressure fluid from the wheel cylinder to the reservoir; pressure-bearing means associated with said slidable member for applying a first biasing force to said slidably member to urge the slidable member to said third position in response to the fluid pressure from the wheel cylinder; electromagnetic force generating means responsive to an electric signal for generating an electromagnetic force to urge said slidable member to said third position; biasing means for normally applying a second biasing force, greater than said first biasing force, to said slidable member to urge the slidable member to said first position; and electric signal supply means for supplying said electromagnetic force generating means with an electric signal to regulate the fluid pressure in the wheel cylinder to cause the sum of the fluid pressure in the wheel cylinder and the electromagnetic force from said electromagnetic force generating means to counterbalance said second biasing force from said biasing means, whereby the fluid pressure in the wheel cylinder is continuously controlled.