BRAKE SYSTEMS WITH MOTOR-DRIVEN MASTER CYLINDERS AND PUMP INLET ATTENTUATORS
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United States of America
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Issued Date -
Mar 6, 2025
app pub date -
Sep 26, 2023
filing date -
Sep 26, 2023
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Abstract
A brake system includes a master cylinder generating pressure at first and second MC outputs for actuating first and second pairs of wheel brakes. A secondary brake module is configured to provide fluid at first and second PTU outputs for actuating the wheel brakes. The secondary brake module includes an electric motor configured to selectively pressurize the hydraulic fluid by transmitting rotary motion to at least two pump pistons. A pump inlet attenuator is interposed hydraulically between a reservoir and the pump pistons and in direct fluid connection with the reservoir via a single return line. An electronic control unit controls at least one of the secondary brake module and the master cylinder responsive to a brake pressure signal. The pump inlet attenuator regulates pressure in the single return line to reduce pressure fluctuations at an inlet side of each pump piston via solely mechanical pressure attenuation.
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