Patent application number | Description | Published |
20080243323 | ELECTRONIC BRAKE SYSTEM PEDAL RELEASE TRANSITION CONTROL APPARATUS AND METHOD - A vehicle is provided having a brake pedal with a detectable travel position and apply force, an electronic braking system component, and a controller having a stored threshold braking force and an algorithm. The algorithm determines a first braking torque request corresponding to the apply force, and a second braking torque request corresponding to the travel position. The first request applies when the apply force is greater than the threshold, and the second request applies when it is not. A calculated third request transitions linearly to the second request when apply pressure drops below the threshold upon pedal release. A method is also provided that includes recording the apply force, travel position, and force and travel-based tables, comparing the apply force to the threshold, applying the braking system component using the force-based table when the apply force exceeds the threshold, and otherwise using a calculated braking torque and travel-based table. | 10-02-2008 |
20080265662 | Brake System Fault Pedal Gain Change Method and System - A brake system fault pedal gain change method and system for brake pedal simulator equipped vehicles such as hybrid electric vehicles is provided. In the event of a brake system booster fault, the method alerts the driver by way of tactile feedback. Additionally, the disclosed method provides a controlled means to gradually increase required brake pedal force during a brake system fault to avoid an abrupt change in brake pedal force when the brake system boost is depleted. | 10-30-2008 |
20080305932 | Method for Shutdown of Vehicle Brakes - At vehicle startup and vehicle shutdown, the driver modulates the brake pressure directly by depressing the brake pedal and the driver feels pedal resistance. During normal conditions of vehicle operation after vehicle startup, pressure boosted actuation of the vehicle brakes is provided by the modulation of boosted pressure from an accumulator via a boost valve operable in response to brake pedal depression, while an isolation valve isolates the pedal from direct influence by the brake pressure and the driver feels pedal resistance provided by a pedal simulator. Upon shutdown of boosted actuation, the boost valve reduces the brake pressure gradually over a calibrated period of time until the brake pressure substantially equals the pedal resistance then felt by the driver. Then the isolation valve reestablishes driver's feel of the brake pressure without an abrupt change in pedal resistance upon the reversion from boosted actuation to hydraulic unboosted actuation. | 12-11-2008 |
20080306667 | Adaptive Electronic Brake System Control Apparatus and Method - A vehicle has a controller with a threshold brake pedal apply force and an algorithm for determining a first braking torque request corresponding to a pedal apply force, a second braking torque request corresponding to a pedal travel position, and a calculated third braking torque request. The third torque request is calculated by multiplying the first torque request by an average percentage variance of the second to the first torque request. An adaptive electronic brake system (EBS) includes force and travel sensors connected to a brake pedal for determining a force-based and travel position braking torque request, and an algorithm for adapting one of the force-based and travel position-based braking torque requests to the other despite variances over time in a force/travel relationship therebetween. | 12-11-2008 |
20090099744 | Brake Assist Exit Method and System for Vehicles - A method for providing a smooth exit from a panic braking assist algorithm, in a vehicle having a braking system with a brake pedal, comprises the steps of measuring a force applied to the brake pedal, measuring a movement of the brake pedal, applying a first level of braking when the force applied to the brake pedal is equal to a predetermined force calibration value, applying a second level of braking when the movement of the brake pedal is equal to a predetermined travel calibration value, and applying a variable level of braking when the force applied to the brake pedal is less than the predetermined force calibration value and the movement of the brake pedal is greater than the predetermined travel calibration value. The variable level of braking is a function of the movement of the brake pedal. | 04-16-2009 |
20090099745 | Brake Assist Driver Command for Vehicles - A method for controlling a braking system in a vehicle during a panic braking event includes the steps of determining a magnitude of force applied to the brake pedal, determining a first level of braking that would result from the magnitude of force applied to the brake pedal if there were no panic braking event, and applying a second level of braking equal to the lesser of the following: the maximum braking capacity, and the level of braking that would result from the magnitude of force applied to the brake pedal if there were no panic braking event, multiplied by a predetermined constant. | 04-16-2009 |
20090105919 | Method and System for Determining Initiation of a Panic Braking Maneuver - A method for determining whether a panic braking maneuver has been initiated in a vehicle with a brake pedal includes the steps of receiving brake pedal travel data, receiving brake pedal force data, determining a rate of change of acceleration of the brake pedal from the brake pedal travel data, determining a rate of change of acceleration of force applied to the brake pedal from the brake pedal force data, comparing the rate of change of acceleration of the brake pedal with a first predetermined value and a third predetermined value, and comparing the rate of change of acceleration of force applied to the brake pedal with a second predetermined value and a fourth predetermined value. | 04-23-2009 |
20090118885 | SYSTEM ARCHITECTURE FOR A BLENDED BRAKING SYSTEM IN A HYBRID POWERTRAIN SYSTEM - An engine and a second power generating device transmit power through a transmission to a driveline to a wheel. A control module determines a regenerative braking axle torque capacity and a regenerative braking torque. Power output from the second power generating device is controlled based upon a regenerative braking axle torque request. A brake control module determines a total braking torque request and generates the regenerative braking axle torque request based upon the total braking torque request, the regenerative braking axle torque capacity, and the regenerative braking torque. The brake control module controls a friction brake. | 05-07-2009 |
20110253100 | CYLINDER COMBUSTION PERFORMANCE MONITORING AND CONTROL WITH COORDINATED TORQUE CONTROL - An engine control system includes a disturbance module, a torque correction module, a torque-to-spark module, and a spark correction module. The disturbance module determines a disturbance value for a past combustion stroke of a cylinder of an engine based on rotation of a crankshaft. The torque correction module selectively determines a torque correction for a future combustion stroke of the cylinder based on the disturbance value. The torque-to-spark module determines a spark correction based on the torque correction and determines an uncorrected spark timing based on a torque request. The spark correction module determines a corrected spark timing based on the uncorrected spark timing and the spark correction and generates spark during the future combustion stroke based on the corrected spark timing. | 10-20-2011 |
20140074373 | COORDINATED ENGINE TORQUE CONTROL - A control system for an engine includes a target air per cylinder (APC) module, a target area module, and a phaser scheduling module. The target APC module determines a target APC based on a target spark timing, a target intake cam phaser angle, and a target exhaust cam phaser angle. The target area module determines a target opening of a throttle valve of the engine based on the target spark timing, the target intake cam phaser angle, and the target exhaust cam phaser angle. The target area module controls the throttle valve based on the target opening. The phaser scheduling module determines the target intake and exhaust cam phaser angles based on the target APC. The phaser scheduling module controls intake and exhaust cam phasers of the engine based on the target intake and exhaust cam phaser angles, respectively. | 03-13-2014 |
20140074374 | COORDINATED TORQUE CONTROL SECURITY SYSTEMS AND METHODS - A control system for an engine includes a selecting module, a target air per cylinder (APC) module, and a phaser scheduling module. The selecting module: selects one of (a) target intake and exhaust cam phaser angles and (b) measured intake and exhaust cam phaser angles; and sets selected intake and exhaust cam phaser angles based on the selected one of the target intake and exhaust cam phaser angles and the measured intake and exhaust cam phaser angles, respectively. The target APC module determines a target APC based on a target spark timing and the selected intake and exhaust cam phaser angles. The phaser scheduling module determines the target intake and exhaust cam phaser angles based on the target APC and controls intake and exhaust cam phasers of the engine based on the target intake and exhaust cam phaser angles, respectively. | 03-13-2014 |
20140163839 | SYSTEMS AND METHODS FOR CONTROLLING CYLINDER DEACTIVATION AND ACCESSORY DRIVE TENSIONER ARM MOTION - A control system for an engine includes a torque modifier module that selects one of a plurality of torque modifier values based on variations in an accessory load. A torque calculating module calculates a maximum torque value for operation in a cylinder deactivation mode based on the selected one of the plurality of torque modifier values. A torque control module selectively switches the engine between the cylinder deactivation mode and a cylinder activation mode based on the maximum torque value. | 06-12-2014 |