BRAKE SYSTEMS WITH MOTOR-DRIVEN MASTER CYLINDERS AND WHEEL-SIDE PRESSURE SENSORS
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United States of America
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Issued Date -
Feb 13, 2025
app pub date -
Aug 10, 2023
filing date -
Aug 10, 2023
priority date (Note) -
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status (Latency Note)
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Abstract
A brake system includes a reservoir and a motor-driven master cylinder for actuating a plurality of wheel brakes. A secondary power transmission unit provides pressurized hydraulic fluid at first and second PTU outputs for actuating the wheel brakes in at least one of a normal non-failure braking mode and a backup braking mode. The secondary power transmission unit includes an electric PTU motor and at least two pump pistons. At least two brake pressure sensors are provided. Each brake pressure sensor is located directly adjacent a corresponding wheel brake for sensing hydraulic pressure at the corresponding wheel brake and responsively producing a brake pressure signal. An electronic control unit is provided for controlling at least one of the secondary power transmission unit and the master cylinder responsive to at least one brake pressure signal. The secondary power transmission unit is directly fluidly connected to the reservoir.
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