Class / Patent application number | Description | Number of patent applications / Date published |
701073000 | On split coefficient surface (u) | 8 |
20100017088 | PRESSURE, TIRE FORCE AND FRICTION ESTIMATION DURING ANTILOCK CONTROL - A method for estimating a brake pressure, a longitudinal tire force and a tire-road μ during periods of antilock control that measures deceleration of a wheel during a period of constant brake pressure, reduces a brake pressure to cause slip on the wheel to begin reducing, measures reacceleration of the wheel after a point in time in which the change in brake pressure is completed, calculates a change in acceleration based on the measured reacceleration and the measured deceleration, estimates a change in brake pressure from a proportional relationship between the change in acceleration and a brake pressure value, estimates a brake pressure from the relationship between a time for valve activation during a change in acceleration and the change in brake pressure. The method also estimates a longitudinal tire force from a mathematical relationship between the change in acceleration, a tire radius, and the estimated brake pressure. The method also estimates tire-road μ by dividing a normal tire force by the estimated longitudinal tire force. | 01-21-2010 |
20120029783 | ROAD SURFACE FRICTION COEFFICIENT ESTIMATING DEVICE - A road surface friction coefficient estimating device includes a means which finds a first estimated value Mnsp_estm of an external force to be compared (S | 02-02-2012 |
20120078483 | Integrated controller for vehicle - In an integrated controller for a vehicle, a main control unit determines whether a road ahead is a split-μ road based on captured images obtained by left and right CCD cameras, and, if so, increases a braking intervention distance correction gain for correcting braking intervention distances set by a collision prevention control unit. The collision prevention control unit performs collision prevention control at a brake timing earlier than usual using the braking intervention distances corrected by the correction gain. Furthermore, when the road ahead is determined to be a split-μ road, the main control unit decreases a target torque correction gain for correcting a target torque set by an engine control unit to prevent the vehicle from becoming unstable as a result of a yaw moment acting on the vehicle generated by a generated driving force due to a difference in friction coefficient μ between left and right road surfaces. | 03-29-2012 |
20130144500 | BRAKING FORCE DISTRIBUTION CONTROL DEVICE FOR A VEHICLE - Disclosed is a braking force distribution control device for a vehicle which has a braking apparatus capable of individually controlling braking forces of the wheels as required. Front or rear wheels having higher braking force sharing rate being referred to control reference wheels and the front or rear wheels having lower braking force sharing rate are referred to control object wheels. A difference value between braking slip index values of the left and right wheels of said control object wheels is referred to a reference difference value. A braking force distribution control is executed on the control object wheels so that the magnitude relationship in wheel speeds of the left and right wheels of the control object wheels is converse to that of the left and right wheels of the control reference wheels. | 06-06-2013 |
20130184956 | VEHICLE BRAKE HYDRAULIC PRESSURE CONTROL APPARATUS - A wheel deceleration calculating sections individually calculate, as negative values, wheel decelerations of front and rear wheels. If, at a time when the antilock braking control for at least one of the right and left front wheels is started or at a time when the antilock braking control for at least one of the right and left rear wheels is started, (i) a maximum value of the wheel decelerations calculated by the wheel deceleration calculating sections is equal to or larger than a first predetermined value and (ii) a difference between the wheel decelerations of the right and left front wheels or the right and left rear wheels which are in an antilock braking control state is equal to or larger than a second predetermined value, a split road determining section determines that road surfaces constitute a split road. | 07-18-2013 |
20130226429 | BRAKING FORCE CONTROL DEVICE - A braking force control device can control braking forces of the respective wheels of a vehicle, suppresses an increase of the braking force of a first wheel that is a wheel having a relatively large slip amount in a pair of right/left wheels and increases the braking force of a second wheel that is a wheel having a relatively small slip amount. The braking force control device may suppress the increase of the braking force of the first wheel before the friction coefficient of a road surface to the first wheel reaches a peak and when the friction coefficient is in the vicinity of the peak. It is preferable to suppress the increase of the braking force of the first wheel by holding the braking force of the first wheel. | 08-29-2013 |
20130245909 | VEHICLE BRAKE HYDRAULIC PRESSURE CONTROL APPARATUS - A vehicle brake hydraulic pressure control apparatus includes an adding section and a control differential pressure setting section. The adding section adds a feedback differential pressure obtained by executing a PI operation in accordance with a yaw rate deviation which is a difference between a target yaw rate being set to a value at which a vehicle turns to a higher coefficient-of-friction road side and an actual yaw rate and a feedforward differential pressure obtained by adding (i) a differential pressure based on a steering angle and (ii) a differential pressure based on a velocity of a vehicle body and the target yaw rate. The control differential pressure setting section sets a control differential pressure based on a value obtained by the adding section, after a predetermined time elapses since start of differential pressure control. | 09-19-2013 |
20140114547 | METHOD AND APPARATUS FOR REAL TIME ESTIMATION OF ROAD SURFACE FRICTION COEFFICIENT - A computer program product, a method and an apparatus for detection of road surface friction coefficient for vehicle stability control are disclosed. The computer program product comprises stored instructions for receiving detected vehicle parameters from a vehicle; calculating a lookup value based on the detected vehicle parameters, the calculating comprising an recursive least square estimation; retrieving a road surface friction coefficient from a lookup table by matching the calculated lookup value to the road surface friction coefficient stored in the lookup table; calculating adjustments to the vehicle using the road surface friction coefficient; and outputting the adjustments to a vehicle control system for execution. | 04-24-2014 |