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US 9,889,835 B1Granted
Active brake retraction system with vacuum reservoir
AssigneeGM Global Technology Operations LLC
InventorsDavid B. Antanaitis, Kevin D. Connor, Douglas N. Reed
Life of this patent
Estimating the term…
Abstract
A vehicle includes a brake system. The brake system includes a hydraulic brake line having a line pressure. The vehicle additionally includes a vacuum reservoir. The vacuum reservoir is selectively fluidly coupled to the hydraulic brake line. The vacuum reservoir is configured to, when fluidly coupled to the hydraulic brake line, reduce the line pressure during a drive cycle.
Claims14
A vehicle comprising:
- a traction wheel;
- a brake system configured to apply braking torque to the traction wheel;
- a hydraulic brake line coupled to the brake system, the hydraulic brake line having a line pressure;
- a vacuum reservoir configured to selectively fluidly couple to the hydraulic brake line during a drive cycle and to, when fluidly coupled to the hydraulic brake line, reduce the line pressures;
- a vacuum source;
- a first valve configured to selectively fluidly couple the vacuum source to the vacuum reservoir;
- a second valve configured to selectively fluidly couple the vacuum reservoir to the hydraulic brake line;
- and
- a controller configured to control the first valve to selectively fluidly couple the vacuum source to the vacuum reservoir, and to control the second valve to selectively fluidly couple the vacuum reservoir to the hydraulic brake line, the controller being configured to, in response to a first operating condition, control the first valve to fluidly couple the vacuum source to the vacuum reservoir and to control the second valve to fluidly isolate the vacuum reservoir from the hydraulic brake line and, in response to a second operating condition, control the first valve to fluidly isolate the vacuum source from the vacuum reservoir and control the second valve to fluidly couple the vacuum reservoir to the hydraulic brake line.
6 more elements
A brake system for a vehicle, comprising:
- a hydraulic brake line having a fluid retained therein, the fluid having a line pressure;
- a vacuum reservoir fluidly couplable to the brake line, the vacuum reservoir being configured to, when fluidly coupled to the hydraulic brake line, reduce the line pressure during a drive cycle;
- a vacuum source;
- a first valve configured to selectively fluidly couple the vacuum source to the vacuum reservoir;
- a second valve configured to selectively fluidly couple the vacuum reservoir to the hydraulic brake line;
- and
- a controller configured to, in response to a first operating condition, control the first valve to fluidly couple the vacuum source to the vacuum reservoir and to control the second valve to fluidly isolate the vacuum reservoir from the hydraulic brake line and, in response to a second operating condition, control the first valve to fluidly isolate the vacuum source from the vacuum reservoir and control the second valve to fluidly couple the vacuum reservoir to the hydraulic brake line.
4 more elements
A method for controlling a brake system for a vehicle, comprising:
- providing a vehicle with a hydraulic brake line having a fluid retained therein, a vacuum reservoir, and a first valve selectively fluidly coupling the hydraulic brake line to the vacuum reservoir;
- providing the vehicle with a vacuum source and a second valve selectively fluidly coupling the vacuum reservoir to the vacuum source;
- in response to a first operating condition during a drive cycle, controlling the first valve to fluidly couple the vacuum reservoir to the hydraulic brake line to reduce pressure in the hydraulic brake line and controlling the second valve to fluidly isolate the vacuum source from the vacuum reservoir;
- and
- in response to a second operating condition during the drive cycle, controlling the first valve to fluidly isolate the vacuum reservoir from the hydraulic brake line controlling the second valve to fluidly couple the vacuum source to the vacuum reservoir.
2 more elements
Dependencies are inferred from the claim text.