Determination of a capacity of a motor vehicle hydraulic pump
AssigneeLucas Automotive GmbH
InventorLeo Gilles
Life of this patent
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Abstract
A method for determining a lack of capacity of a pump, actuated by an electric motor, of a hydraulic brake system of a motor vehicle comprises the steps of generating a hydraulic pressure in a first brake circuit of the brake system by means of a plurality of pump elements of the pump that are assigned to the first brake circuit, limiting the generated hydraulic pressure to a test pressure and simultaneously acquiring a motor-related parameter, and determining a lack of capacity of at least one of the pump elements on the basis of a comparison of the parameter with a comparison value.
Claims13
A method for pressure sensor independently determining a lack of capacity of a pump, actuated by an electric motor, of a hydraulic brake system of a motor vehicle, comprising the following steps:
- generating a hydraulic pressure in a first brake circuit of the brake system by means of a plurality of pump elements of the pump that are assigned to the first brake circuit;
- limiting the generated hydraulic pressure by means of a hydraulic discharge valve assigned to the first brake circuit to a test pressure being higher than an operational braking pressure and simultaneously acquiring a first motor-related parameter associated with the provided test pressure;
- and
- determining a lack of capacity of at least one of the pump elements on the basis of a comparison of the parameter with a comparison value and independently of a pressure sensor.
A device for pressure sensor independently determining a lack of capacity of a pump, actuated by an electric motor, of a hydraulic brake system of a motor vehicle, comprising:
- a pump for generating a hydraulic pressure in a first brake circuit of the brake system by means of a plurality of pump elements of the pump that are assigned to the first brake circuit;
- a first limiting device in the form of a hydraulic discharge valve for limiting the hydraulic pressure to a test pressure being higher than an operational braking pressure;
- an acquisition device for simultaneously acquiring a first motor-related parameter associated with the provided test pressure;
- and
- a determination device for determining a lack of capacity of at least one of the pump elements on the basis of a comparison of the parameter with a comparison value and independently of a pressure sensor.
Dependencies are inferred from the claim text.