Ford Global Technolgoies, LLC

Christian Schmaler

Ian Moore

Matthias Baumann

Thomas Svensson

Karl-Peter Hesseler

Martin Knuettel

Olga Bergen

A braking system for a motor vehicle includes a hydraulic service brake for braking the motor vehicle in driving operation, an electric parking brake for holding the motor vehicle at a standstill, and an electronic control system for automatically controlling the parking brake and the service brake. The electronic control system may be adapted to activate the parking brake, with the service brake activated, after the motor vehicle has been braked to the standstill via the activated service brake, and to at least partly deactivate the activated service brake after the parking brake has been activated. The electronic control system may also be adapted to deactivate the activated parking brake following operation of an accelerator pedal of the motor vehicle.

Motor vehicle with hydraulically supported electric parking brake and method for operating the same

A method for operating a hydraulic brake system of a motor vehicle having a brake booster and a hydraulic brake boost wherein a brake pressure is detected and an underpressure, prevailing in an underpressure chamber of the brake booster is estimated on the basis of the detected brake pressure. The hydraulic brake boost controlled based on the estimated underpressure, with the estimated underpressure taking into account an actuation of the hydraulic brake boost.

Method for operating a motor vehicle hydraulic brake system

A method and system for determining the pressure in a brake booster used to actuate a brake system having at least one main brake cylinder. The brake booster connected in a fluid-conducting manner by a non-return valve to an intake manifold of an internal combustion engine. A reduced pressure loss in the brake booster resulting from actuation of the main brake cylinder is balanced with the reduced pressure gain in the brake booster as a result of a pressure difference between the brake booster pressure and the intake manifold pressure. The reduced pressure gain in the brake booster is determined based on time, the air mass flow between the brake booster, and the intake manifold.

System and method for determining brake booster pressure

A method for fault diagnosis of a vacuum system having a vacuum source and a vacuum consumer connected to the vacuum source via a connecting line with a non-return valve disposed in the connecting line upstream of the vacuum source. The method including indirectly determining a vacuum in the vacuum consumer based on an estimated vacuum value. Providing a flow sensor, using the flow sensor to measure a flow in the connecting line and drawing a conclusion regarding a defect based on the estimated vacuum value and the flow. An exemplary embodiment may also include a combined check valve and flow sensor.

Method for diagnosing fault in a vacuum system including a check valve

A method for operating a motor vehicle having an internal combustion engine, a service brake, a brake booster, a parking brake, a wheel-speed sensor and an inclination sensor is disclosed. The method including measuring the speed of motor vehicle using the wheel-speed sensor to create a speed signal. An inclination of the motor vehicle with respect to the direction the motor vehicle is sensed and an angle signal is created. The internal combustion engine is started when the speed measured is greater than zero and the inclination of the motor vehicle is greater than a predetermined value, such that the internal combustion engine creates a partial vacuum to power the brake booster to assist with the operation of the service brake.

Method for operating a motor vehicle having a start/stop system

A method for actuating an electric vacuum pump of a brake booster including indirectly ascertaining a negative pressure in the brake booster. Depending on the indirectly ascertained negative pressure, and on a pumping capacity of the vacuum pump, ascertaining at least one activation parameter for the vacuum pump. Activating the vacuum pump in accordance with the activation parameter, when the indirectly ascertained negative pressure drops below a predefined minimum value.

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Aachen, Germany

Christian Schmaler