Brake system with noise-optimized valve control
AssigneeContinental Automotive Technologies GmbH
InventorsAnne Seidel, Holger Kollmann, Christian Courth
Life of this patent
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Abstract
A brake system for a motor vehicle comprises a hydraulic line system with at least one normally closed hydraulic valve, wherein a final stage is provided for electrically actuating the at least one hydraulic valve. To minimize noise emissions, the final stage is a final stage with analog control and a computing unit is provided which is configured to determine a valve current based on a pressure difference across the hydraulic valve and to actuate the final stage to make the valve current available at the hydraulic valve.
Claims9
A brake system for a motor vehicle comprising:
- a hydraulic line system with at least one hydraulic valve which is normally closed;
- an electric coil which is supplied with current by a final stage having analog control is provided for electrically actuating the at least one hydraulic valve;
- and
- a computing unit is-provided-which is configured to:
- determine a counterforce at least from a spring force of the hydraulic valve and the pressure difference across the hydraulic valve;
- determine from the counterforce an opening force which is greater than the counterforce by a predetermined amount:
- determine an associated valve opening current from the opening force;
- and
- actuate the final stage when the hydraulic valve is switched on to provide the associated valve opening current.
A method for controlling a hydraulic valve, which is normally closed, in a brake system comprising:
- determining a pressure difference across a hydraulic valve:
- calculating a counterforce from at least a spring force of the hydraulic valve and the pressure difference across the hydraulic valve;
- calculating from the counterforce a switching force, wherein the counterforce is one of greater and less than the counterforce by a predetermined amount;
- and
- calculating a valve current from the switching force;
- and
- providing the valve current with a final stage that has analog control.
Dependencies are inferred from the claim text.