Electro-Hydraulic braking system having isolation pistons
AssigneeDelphi Technologies, Inc.
InventorsDavid F. Reuter, Jerry L. Newton, Robert S. Mattern
Life of this patent
Estimating the term…
Abstract
An electro-hydraulic brake system containing four isolation piston assemblies each of which is comprised of a cylinder, a piston, and a pair of hydraulic lines. The cylinder has only two apertures, and the piston is disposed in the cylinder. The first hydraulic line communicates between a wheel brake and a first side of the piston through one of the apertures. The second hydraulic line communicates between an accumulator and a second side of the piston through the other of the apertures. The system components are arranged in a compact, easy to manufacture package.
Claims17
An isolation piston assembly comprising:
- a cylinder having only two apertures;
- a piston disposed in the cylinder;
- a first hydraulic line communicating between a wheel brake and a first side of the piston through one of the apertures;
- and
- a second hydraulic line communicating between an accumulator and a second side of the piston through the other of the apertures.
A brake circuit comprising:
- a wheel brake;
- an accumulator;
- and
- an isolation piston assembly including a cylinder having only two apertures, a piston disposed in the cylinder, a first hydraulic line communicating between the wheel brake and a first side of the piston through one of the apertures, and a second hydraulic line communicating between the accumulator and a second side of the piston through the other of the apertures.
A method of testing a seal disposed around a piston movable in a cylinder, the method comprising:
- providing a master cylinder in communication with a first side of the piston;
- developing pressure on a second side of the piston sufficient to move the piston in the cylinder;
- isolating the master cylinder from the first side of the piston;
- and
- measuring pressure on the first side of the piston.
A hydraulic modulator comprising:
- four isolation piston assemblies, each isolation piston assembly including a cylinder having only two apertures, a piston disposed in the cylinder, a first hydraulic line communicating between a wheel brake and a first side of the piston through one of the apertures, and a second hydraulic line communicating between the accumulator and a second side of the piston through the other of the apertures.
Dependencies are inferred from the claim text.