Vehicle motion control apparatus
First Claim
1. A vehicle motion control apparatus comprising:
- wheel brake cylinders operatively associated with wheels of a vehicle, respectively;
a master cylinder connected to said wheel brake cylinders through a dual hydraulic circuit with a pair of wheel brake cylinders included in each hydraulic circuit, said master cylinder discharging a hydraulic braking pressure into each hydraulic circuit in response to operation of a brake pedal;
normally open switching valves each disposed between said master cylinder and each of said pair of wheel brake cylinders, each of said normally open switching valves supplying the hydraulic braking pressure discharged from said master cylinder into each of said pair of wheel brake cylinders when each of said normally open switching valves is placed in an open position thereof;
normally closed switching valves each connected to a passage between each of said normally open switching valves and each of said pair of wheel brake cylinders, each of said normally closed switching valves reducing the hydraulic braking pressure in each of said pair of wheel brake cylinders when each of said normally closed switching valves is placed in an open position thereof;
proportional pressure difference valve means disposed between said master cylinder and said normally open switching valves in each hydraulic circuit, said valve means regulating a pressure difference between the hydraulic pressure at the side of said master cylinder and the hydraulic pressure at the side of said normally open switching valves to be of a desired value;
automatic hydraulic pressure generating means for generating a hydraulic braking pressure independently of said master cylinder and irrespective of operation of said brake pedal, and supplying the hydraulic braking pressure into a passage between said valve means and said normally open switching valves in each hydraulic circuit;
vehicle state monitor means for monitoring state variable of said vehicle; and
control means for controlling said pressure generating means on the basis of the state variable of said vehicle monitored by said vehicle state monitor means, said control means placing said normally open switching valve connected to one of said wheel brake cylinders in one hydraulic circuit of said dual hydraulic circuits, in the closed position, and placing said normally open switching valve connected to the other one of said wheel brake cylinders in said one hydraulic circuit, in the open position, and controlling said valve means on the basis of the state variable of said vehicle monitored by said vehicle state monitor means.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention is directed to a vehicle motion control apparatus, which includes normally open valves to supply hydraulic pressure discharged from a master cylinder into wheel brake cylinders, normally closed valves to reduce the wheel cylinder pressure, and a proportional pressure difference valve which is disposed between the master cylinder and the normally open valves, to regulate a pressure difference between the hydraulic pressure at the side of the master cylinder and the hydraulic pressure at the side of the normally open valves to be of a desired value. A pressure generating device is provided for generating the hydraulic pressure independently of the master cylinder to supply it into a passage between the pressure difference valve and the normally open valves. The normally open valve connected to one of the wheel brake cylinders in one hydraulic circuit, is placed in its closed position, and the normally open valve connected to the other one of the wheel brake cylinders, is placed in its open position, and then the pressure difference valve is controlled on the basis of the monitored vehicle state variable.
23 Citations
5 Claims
-
1. A vehicle motion control apparatus comprising:
-
wheel brake cylinders operatively associated with wheels of a vehicle, respectively;
a master cylinder connected to said wheel brake cylinders through a dual hydraulic circuit with a pair of wheel brake cylinders included in each hydraulic circuit, said master cylinder discharging a hydraulic braking pressure into each hydraulic circuit in response to operation of a brake pedal;
normally open switching valves each disposed between said master cylinder and each of said pair of wheel brake cylinders, each of said normally open switching valves supplying the hydraulic braking pressure discharged from said master cylinder into each of said pair of wheel brake cylinders when each of said normally open switching valves is placed in an open position thereof;
normally closed switching valves each connected to a passage between each of said normally open switching valves and each of said pair of wheel brake cylinders, each of said normally closed switching valves reducing the hydraulic braking pressure in each of said pair of wheel brake cylinders when each of said normally closed switching valves is placed in an open position thereof;
proportional pressure difference valve means disposed between said master cylinder and said normally open switching valves in each hydraulic circuit, said valve means regulating a pressure difference between the hydraulic pressure at the side of said master cylinder and the hydraulic pressure at the side of said normally open switching valves to be of a desired value;
automatic hydraulic pressure generating means for generating a hydraulic braking pressure independently of said master cylinder and irrespective of operation of said brake pedal, and supplying the hydraulic braking pressure into a passage between said valve means and said normally open switching valves in each hydraulic circuit;
vehicle state monitor means for monitoring state variable of said vehicle; and
control means for controlling said pressure generating means on the basis of the state variable of said vehicle monitored by said vehicle state monitor means, said control means placing said normally open switching valve connected to one of said wheel brake cylinders in one hydraulic circuit of said dual hydraulic circuits, in the closed position, and placing said normally open switching valve connected to the other one of said wheel brake cylinders in said one hydraulic circuit, in the open position, and controlling said valve means on the basis of the state variable of said vehicle monitored by said vehicle state monitor means. - View Dependent Claims (2, 3, 4, 5)
-
Specification