Abstract: A braking control system of a vehicle includes a pressure control device that regulates brake fluid flow to a brake caliper of a wheel from a brake fluid cylinder. A pressure sensor measures a pressure of the brake fluid applied to the brake caliper. A filter module filters the measured pressure based on a rotational frequency of the wheel. The filtering produces a filtered pressure of the brake fluid applied to the brake caliper. A target pressure module sets a target pressure for the brake fluid for application to the brake caliper. A difference module determines a pressure difference between the filtered pressure and the target pressure. A pressure control module actuates the pressure control device based on the pressure difference.

Abstract: A braking control system of a vehicle includes a pressure control device that regulates brake fluid flow to a brake caliper of a wheel from a brake fluid cylinder. A pressure sensor measures a pressure of the brake fluid applied to the brake caliper. A filter module filters the measured pressure based on a rotational frequency of the wheel. The filtering produces a filtered pressure of the brake fluid applied to the brake caliper. A target pressure module sets a target pressure for the brake fluid for application to the brake caliper. A difference module determines a pressure difference between the filtered pressure and the target pressure. A pressure control module actuates the pressure control device based on the pressure difference.

Abstract: A method for detecting the location of and isolating a leak in a braking system by simultaneously controlling a direct apply subsystem (DAS) and an isolated apply subsystem (IAS) to enable fluid communication between the IAS and the first circuit; to block fluid communication of the DAS with the first circuit; to enable fluid communication of the DAS with the second circuit; and to block fluid communication of the IAS with the second circuit. A sensed travel of an isolated apply component and a sensed fluid pressure developed by the IAS may be used to determine if the leak is present in the first circuit, while simultaneously using the sensed travel of a direct apply component of the DAS, and a sensed fluid pressure developed by the DAS, to determine if the leak is present in the second circuit.

Abstract: A method for detecting the location of and isolating a leak in a braking system by simultaneously controlling a direct apply subsystem (DAS) and an isolated apply subsystem (IAS) to enable fluid communication between the IAS and the first circuit; to block fluid communication of the DAS with the first circuit; to enable fluid communication of the DAS with the second circuit; and to block fluid communication of the IAS with the second circuit. A sensed travel of an isolated apply component and a sensed fluid pressure developed by the IAS may be used to determine if the leak is present in the first circuit, while simultaneously using the sensed travel of a direct apply component of the DAS, and a sensed fluid pressure developed by the DAS, to determine if the leak is present in the second circuit.

Abstract: A method of controlling disturbances associated with electric power steering (EPS) systems maintains an original assist torque to feedback signal in the EPS, such as a column torque, and further minimizes the impact from the disturbance source to the feedback signal so that the disturbance is rejected while the original steering feel is maintained. The method further considers interaction of the rejection feature with other functions of the EPS. In one embodiment, relationships for isolating the disturbance are achieved by utilizing a combined feedback and feed-forward compensator.

Abstract: A method of controlling disturbances associated with electric power steering (EPS) systems maintains an original assist torque to feedback signal in the EPS, such as a column torque, and further minimizes the impact from the disturbance source to the feedback signal so that the disturbance is rejected while the original steering feel is maintained. The method further considers interaction of the rejection feature with other functions of the EPS. In one embodiment, relationships for isolating the disturbance are achieved by utilizing a combined feedback and feed-forward compensator.

Abstract: A method for efficiently decelerating a vehicle having front and rear wheel brakes by isolating the rear wheel brakes and applying pressurized brake fluid only to the front wheel brakes.

Abstract: An active nibble control (ANC) includes an anti-notch filter that increases the gain margin of the control and, therefore, greater disturbance rejection. The closed loop frequency response of the ANC is further enhanced by the addition of a lag-lead phase compensator filter. The addition of the lag-lead compensation filter allows use of the higher ANC gains at higher wheel frequencies to increase disturbance rejection, thereby compensating for anti-notch filter gain reduction with increasing wheel frequency. Similar results are obtained by adding a lag-lead phase compensator filter to a resonator filter in an active ANC.

Abstract: A method for efficiently decelerating a vehicle having front and rear wheel brakes by isolating the rear wheel brakes and applying pressurized brake fluid only to the front wheel brakes.

Abstract: A periodic test signal (44) is injected into a sensor and the sensor output (46) is compared to a threshold to determined whether the sensor is functioning properly.

Abstract: The rates of change and difference between signals sensed at adjacent electronic module output ports are determined and compared to criteria to determine whether the output ports are shorted.

Abstract: Under certain operating conditions, the pressure applied to a vehicle rear brake circuit is increased above the pressure applied to the vehicle front brake circuit to enhance stopping of the vehicle.

Abstract: A periodic test signal (44) is injected into a sensor and the sensor output (46) is compared to a threshold to determined whether the sensor is functioning properly.

Abstract: A method is provided for controlling a low speed operation of a vehicle. A speed activation switch is activated. A target vehicle speed is calculated in response to an accelerator pedal demand as determined by an accelerator pedal position where each respective accelerator pedal position is associated with a respective predetermined target vehicle speed. A vehicle turning geometry is determined in response to a steering wheel angle input. A target wheel speed of each of a plurality of vehicle wheels is calculated as a function of the target vehicle speed and turning geometry. An actual wheel speed of each wheel is measured. A net torque is determined in response to the target wheel speeds and actual wheel speeds. An engine output torque and a braking torque are determined in response to the net torque. The engine output torque and the total vehicle braking torque are controlled for cooperatively maintaining the target vehicle speed.

Abstract: An apparatus and method for determining the presence of excessive yaw rate in a vehicle by calculating an instability index that is a function of the vehicle yaw rate and generating an excessive yaw rate signal when the instability index exceeds a yaw rate threshold.

Abstract: An Electronic Brake Control System having four channels and three wheel speed sensors. The wheel speed sensors include a pair or speed sensors for monitoring the speeds of the individual front wheels and a single speed sensors for monitoring the speed of both rear wheels. The system monitors front wheel speeds during wheel acceleration and, upon detecting excessive slippage of one of the front wheels and the rear axle, applies the front and rear wheel brakes on the side of the slipping front wheel to transfer driving torque to the side of vehicle with a higher coefficient of road surface friction. Alternately, with a four wheel drive vehicle, both rear wheel brakes can be applied to transfer driving torque to the front wheels. The system also senses vehicle parameters during turning maneuvers and, upon detecting an understeer situation, the system is operative to apply one of the rear wheel brakes to correct the undeersteer.