Brake control system and restriction adjusting valve for vehicles

A restriction adjusting valve comprising:

• a housing having a first communication hole into which an operating oil flows, an introduction passage into which said operating oil is introduced and a second communication hole from which said operating oil flows out;
• a sliding member provided inside said housing to be slidable and having a valve body for opening and closing an end portion of said first communication hole, said sliding member being slidably received in said introduction passage and said sliding member having a pressure-receiving portion which receives said operating oil introduced into said introduction passage, said sliding member being arranged between said first communication hole and said introduction passage;
• a spring member for biasing said sliding member in a biasing direction whereby said valve body opens said end portion of said first communication hole;
• and
• electromagnetic force generating means for generating an electromagnetic force in correspondence with an energization current value, said electromagnetic force biasing said valve body in an energized direction opposite to said biasing direction;
• said sliding member being biased in said energized direction to close said first communication hole via said valve body due to said operating oil applied to said sliding member via said introduction passage.

A restriction adjusting valve provided in a hydraulic line from a high-pressure side to a low-pressure side for controlling a flow passage area of said hydraulic line, said restriction adjusting valve comprising:

• a housing having an oil chamber communicating with said low-pressure side of said hydraulic line, said housing further having a first communication hole and an introduction passage each establishing communication between said oil chamber and said high-pressure side of said hydraulic line;
• an armature having a slide member slidably received in said introduction passage, said armature further having a valve body for opening and closing, from a side of said oil chamber, an open end of said first communication hole, said armature being disposed substantially between said first communication hole and said introduction passage;
• a biasing member for biasing said armature in a first direction that said valve body closes said open end of said first communication hole;
• electromagnetic force generating means for generating an electromagnetic force in correspondence with an energization current value, said electromagnetic force biasing said armature in a second direction opposite to said first direction of said biasing member;
• said armature being biased in said first direction to close said first communication hole via said valve body due to a hydraulic pressure applied to said slide member from said high-pressure side of said hydraulic line via said introduction passage;
• and
• an area, on said slide member, which receives hydraulic pressure applied from said high-pressure side of said hydraulic line via said introduction passage being set equal to an area, on said valve body, which receives hydraulic pressure applied from said high-pressure side of said hydraulic line via said first communication hole when said valve body closes said open end of said first communication hole.

A brake control system for a motor vehicle, comprising:

• a restriction adjusting valve provided at least in one of hydraulic lines from a hydraulic pressure generating source to a wheel-braking cylinder and from said wheel-braking cylinder to a reservoir, said restriction adjusting valve comprising:
• a housing having an oil chamber communicating with a low-pressure side of said hydraulic line, said housing further having a first communication hole and an introduction passage each establishing communication between said oil chamber and a high-pressure side of said hydraulic line;
• an armature having a slide member slidably received in said introduction passage, said armature further having a valve body for opening and closing, from a side of said oil chamber, an open end of said first communication hole, said armature being disposed substantially between said first communication hole and said introduction passage;
• a biasing member for biasing said armature in a first direction;
• electromagnetic force generating means for generating an electromagnetic force in correspondence with an energization current value, said electromagnetic force biasing said armature in a second direction opposite to said first direction of said biasing member;
• said armature being biased to close said first communication hole via said valve body due to a hydraulic pressure applied to said slide member from said high-pressure side of said hydraulic line via said introduction passage;
• an area, on said slide member, which receives hydraulic pressure applied from said high-pressure side of said hydraulic line via said first communication hole being set equal to an area, on said valve body, which receives hydraulic pressure applied from said high-pressure side of said hydraulic line via said introduction passage when said valve body closes said open end of said first communication hole;
• and
• said energization current value being controlled according to an external command for adjusting a flow passage area provided at said open end of said first communication hole to increase and decrease a hydraulic braking pressure in said wheel-braking cylinder.

A restriction adjusting valve comprising:

• a housing having a first communication hole into which an operating oil flows, an introduction passage into which said operating oil is introduced and a second communication hole from which said operating oil flows out;
• a sliding member provided inside said housing to be slidable and having a valve body for opening and closing an end portion of said first communication hole, said sliding member being slidably received in said introduction passage and said sliding member having a pressure-receiving portion which receives said operating oil introduced into said introduction passage, said sliding member being arranged between said first communication hole and said introduction passage;
• a spring member for biasing said sliding member in a biasing direction whereby said valve body closes said end portion of said first communication hole;
• and
• electromagnetic force generating means for generating an electromagnetic force in correspondence with an energization current value, said electromagnetic force biasing said valve body in an energized direction opposite to said biasing direction;
• said sliding member being biased in said biasing direction to close said first communication hole via said valve body due to said operating oil applied to said sliding member via said introduction passage.

A restriction adjusting valve provided in a hydraulic line from a high-pressure side to a low-pressure side for controlling a flow passage area of said hydraulic line, said restriction adjusting valve comprising:

• a housing having an oil chamber communicating with said low-pressure side of said hydraulic line, said housing further having a first communication hole and an introduction passage each establishing communication between said oil chamber and said high-pressure side of said hydraulic line;
• an armature having a slide member slidably received in said introduction passage, said armature further having a valve body for opening and closing, from a side of said oil chamber, an open end of said first communication hole, said armature being disposed substantially between said first communication hole and said introduction passage;
• a biasing member for biasing said armature in a first direction that said valve body opens said open end of said first communication hole;
• electromagnetic force generating means for generating an electromagnetic force in correspondence with an energization current value, said electromagnetic force biasing said armature in a second direction opposite to said first direction of said biasing member;
• said armature being biased in said second direction to close said first communication hole via said valve body due to a hydraulic pressure applied to said slide member from said high-pressure side of said hydraulic line via said introduction passage;
• and
• an area, on said slide member, which receives hydraulic pressure applied from said high-pressure side of said hydraulic line via said first communication hole being set equal to an area, on said valve body, which receives hydraulic pressure applied from said high-pressure side of said hydraulic line via said introduction passage when said valve body closes said open end of said first communication hole.