Anti-skid control apparatus
AssigneeNippondenso Co., Ltd.
InventorsMasaki Ohoka, Toshiya Morikawa, Takashi Watanabe
Life of this patent
Estimating the term…
Abstract
An anti-skid control apparatus which can be manufactured at low cost by reducing the number of valves that control the flow of brake fluid has a master cylinder, a first conduit which includes a first branch conduit and a second branch conduit, a cut-off valve, a first control valve installed in the second branch conduit, a second control valve installed in the second branch conduit and connected to a second wheel cylinder, a second conduit connecting the second control valve and a reservoir, a third control valve installed in the second conduit, and a pump connected in parallel with the third control valve. This arrangement permits flexible anti-skid braking operations using a reduced number of components.
Claims22
An anti-skid control apparatus comprising:
- a master cylinder for generating brake fluid pressure;
- a first conduit having first and second branch conduits for supplying said brake fluid pressure from said master cylinder to a first wheel cylinder and a second wheel cylinder;
- a cut-off valve between said master cylinder and a junction point of said first and second branch conduits, for selectively supplying and cutting off brake fluid from said master cylinder;
- a first control valve in said second branch conduit for controlling brake fluid flow in said second branch conduit;
- a second control valve between said first control valve and said second wheel cylinder in said second branch conduit for controlling brake fluid flow in said second branch conduit;
- a second conduit extending from a point between said first control valve and said second control valve to a reservoir;
- a third control valve in said second conduit for controlling brake fluid flow in said second conduit;
- a pump in parallel with said third control valve for pumping up brake fluid from said reservoir and supplying said pumped up brake fluid to said first and second wheel cylinders.
A method of performing anti-skid brake control, said method comprising the steps of:
- establishing a master-wheel brake fluid flow path from a master cylinder to one of first and second wheel cylinders, using a cutoff valve disposed in a first conduit connected to said master cylinder and having first and second branch conduits each connected to a respective one of said first and second wheel cylinders and a first control valve disposed in said second branch conduit, each in an open state, said cutoff valve being between said master cylinder and a junction point of said first and second branch conduits;
- maintaining pressure in said first wheel cylinder by closing said cutoff valve and said first control valve;
- maintaining pressure in said second wheel cylinder by closing a second control valve disposed in said second branch conduit between said first control valve and said second wheel cylinder;
- establishing a cylinder-reservoir flow path to reduce pressure in one of said wheel cylinders by opening a third control valve disposed in a second conduit connecting a point on said second branch conduit between said first and second control valves and a reservoir;
- and
- establishing a pump-cylinder flow path using a pump connected to a third conduit in parallel with said third control valve to increase pressure in one of said wheel cylinders by closing said third control valve.
Dependencies are inferred from the claim text.