Back to results
US 11,097,710 B2Granted
Purge procedure for a decoupled brake system and brake system implementing this procedure
AssigneeRobert Bosch GmbH
InventorChris Anderson
Life of this patent
Estimating the term…
Abstract
A method (purge procedure) for purging a decoupled brake system including: a brake fluid reservoir, a master cylinder, a brake circuit connected to the wheel brakes, a pump equipped with a plunger. A segment of the brake circuit to be purged is isolated by closing the solenoid valves at the extremities of the segment, a vacuum is created with the plunger, and an extremity of this segment is placed in communication with the exterior to evacuate the trapped air bubble.
Claims5
A method for purging a decoupled brake system, the method comprising:
- selecting a site likely to contain a gas pocket to be purged from a brake circuit, wherein the brake system includes a brake fluid reservoir, a master cylinder connected to the brake pedal by a thrust rod, a pedal travel sensor to detect thrust rod travel, the brake circuit connecting the master cylinder to the wheel brakes, and a management unit to manage operation of the brake system as a function of a braking request made by actuation of the brake pedal;
- defining a channel segment having a first extremity and a second extremity, each equipped with a solenoid valve including the site and a source of pressure or vacuum with an intermediate solenoid valve between the site and the pressure or vacuum source;
- delimiting an outgoing subsegment, wherein the second extremity beyond the corresponding solenoid valve is configured to communicate with the outside atmosphere;
- closing the extremity solenoid valves and allowing the intermediate solenoid valve to remain open;
- creating a vacuum with the source in the segment thus isolated and maintaining the vacuum throughout a period of time, depending on the parameters of the isolated segment;
- closing the intermediate solenoid valve to trap, beyond this intermediate solenoid valve, in the outgoing subsegment, the gas pocket or gas bubble that has migrated beyond this intermediate solenoid valve;
- opening the solenoid valve at the second extremity of the channel segment to open communication of the subsegment toward the outlet;
- and
- applying pressure from the pressure or vacuum source to the subsegment between the intermediate solenoid valve and the outlet to evacuate the gas bubble through the outlet.
6 more elements
A decoupled brake system, comprising:
- a brake fluid reservoir;
- a master cylinder connected to the brake pedal by a thrust rod;
- a pedal travel sensor to detect a travel of the thrust rod;
- a brake circuit to connect the master cylinder to the wheel brakes;
- and
- a management unit to manage operation of the brake system as a function of the brake request through actuation of the brake pedal;
- wherein the management unit has a program for purging the decoupled brake system, by performing the following:
- selecting a site likely to contain a gas pocket to be purged from a brake circuit, wherein the brake system includes the brake fluid reservoir, the master cylinder connected to the brake pedal by the thrust rod, the pedal travel sensor to detect the thrust rod travel, the brake circuit connecting the master cylinder to the wheel brakes, and the management unit to manage operation of the brake system as a function of the braking request made by actuation of the brake pedal;
- defining a channel segment having a first extremity and a second extremity, each equipped with a solenoid valve including the site and a source of pressure or vacuum with an intermediate solenoid valve between the site and the pressure or vacuum source;
- delimiting an outgoing subsegment, wherein the second extremity beyond the corresponding solenoid valve is configured to communicate with the outside atmosphere;
- closing the extremity solenoid valves and allowing the intermediate solenoid valve to remain open;
- creating a vacuum with the source in the segment thus isolated and maintaining the vacuum throughout a period of time, depending on the parameters of the isolated segment;
- closing the intermediate solenoid valve to trap, beyond this intermediate solenoid valve, in the outgoing subsegment, the gas pocket or gas bubble that has migrated beyond this intermediate solenoid valve;
- opening the solenoid valve at the second extremity of the channel segment to open communication of the subsegment toward the outlet;
- and
- applying pressure from the pressure or vacuum source to the subsegment between the intermediate solenoid valve and the outlet to evacuate the gas bubble through the outlet.
13 more elements
Dependencies are inferred from the claim text.