Method and device for determining a value representing the system pressure in a brake circuit
AssigneeRobert Bosch GmbH
InventorsAndreas Erban, Karl-Josef Weiss, Manfred Gerdes
Life of this patent
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Abstract
A method and a device for determining a quantity describing the brake circuit pressure, with which the brake circuit pressure is determined for a pressure buildup, in particular a pressure buildup independent of the driver, and also for a pressure reduction. In a pressure buildup independent of the driver, the delivery performance of the pump which delivers the brake medium and is detected with sensing means is taken into account in determining the brake circuit pressure. In a pressure reduction, the brake circuit pressure is determined as a function of a quantity which describes the brake circuit pressure to be expected after the pressure reduction.
Claims21
A brake system in a vehicle, the vehicle including at least one wheel associated with a wheel brake cylinder, comprising:
- a first arrangement adjusting at least one of a pressure buildup state, a pressure holding state and a pressure reduction state of the wheel brake cylinder;
- at least one brake circuit coupled to the wheel brake cylinder via the first arrangement, the at least one wheel being assigned to the at least one brake circuit, the at least one brake circuit including at least one second arrangement which has at least one pump, the at least one pump providing the pressure buildup state in the wheel brake cylinder of one of the at least one wheel independent of a driver action,
- a third arrangement determining a specific quantity which represents a pressure of the at least one brake circuit;
- and
- a fourth arrangement detecting a delivery performance of the at least one pump during the pressure buildup state independent of the driver action,
- wherein the third arrangement determines the specific quantity as a function of the detected delivery performance during the pressure buildup state independent of the driver action.
A brake system in a vehicle, the vehicle including at least one wheel assigned to a wheel brake cylinder, comprising:
- a first arrangement adjusting at least one of a pressure buildup state, a pressure holding state and a pressure reduction state of the wheel brake cylinder;
- at least one brake circuit coupled to the wheel brake cylinder via the first arrangement, the at least one wheel being assigned to the at least one brake circuit;
- a second arrangement determining a first quantity representing a first pressure of the at least one brake circuit;
- and
- a third arrangement determining a second quantity representing a second pressure of the at least one brake circuit expected after the pressure reduction state,
- wherein, during the pressure reduction state, the second arrangement determines the first quantity as a function of the second quantity.
A method for determining a first quantity representing a pressure of a brake circuit in a brake system, comprising the steps of:
- increasing a pressure of a wheel brake cylinder assigned to at least one wheel independently of a driver action;
- detecting a delivery performance of a pump;
- determining a second quantity representing a status of the brake circuit;
- and
- when the pressure is increasing, determining the first quantity as a function of the second quantity,
- wherein, when the pressure is increasing, the second quantity is determined as a function of the delivery performance independent of the driver action.
A method for determining a first quantity representing a first pressure of a brake circuit of a brake system, comprising the steps of:
- decreasing the first pressure of a wheel brake cylinder assigned to at least one wheel;
- determining a second quantity representing a second pressure of the brake circuit expected after the first pressure is decreased;
- and
- when the first pressure is decreasing, determining the first quantity as a function of the second quantity.
Dependencies are inferred from the claim text.