 Incremental route calculation |
| The present invention provides a way in which an intermediate route may be determined to a location ... |
|
| Altitude sparse aircraft display |
| The invention provides a system, method, apparatus, and computer program product for avoiding ... |
|
| System for recalculating a path |
| The present invention, roughly described, provides for a system for finding a new path from a new ... |
|
| System for determination of optimal travel path in a multidimensional space |
| The present automated vehicle travel path determination system computes a travel path for a ... |
|
| Method for automatically controlling a vehicle for the lateral avoidance of a fixed zone |
| The objective of the present invention is to eliminate these drawbacks. It is also aimed at ... |
|
| Computation of routes for bounding overwatch operations |
| What is claimed is: 1. A computer method for determining the routes of at least first and second ... |
|
| Control apparatus, control method, and engine control unit |
| The present invention has been made to solve the foregoing problem, and it is an object of the ... |
|
| Electric power-assisted wheelchair |
| This invention is adapted to be embodied in a power-assisted, manually operated wheelchair having a ... |
|
| Service-oriented community agent |
| The present invention overcomes the limitations of currently existing real-time data acquisition ... |
|
|
Method and system for estimating vehicle speed reference value
| Details |
Inventors: Weber, Darryl C.;
Assignee: Kelsey-Hayes Company (Livonia, MI)
Primary Examiner: Teska; Kevin J.
Assistant Examiner: Walder, Jr.; Stephen J.
Attorney, Agent or Firm: MacMillan, Sobanski & Todd
An improved method of estimating a vehicle speed reference value (VREF) at a wheel so as to prevent false slip detection and premature ABS activation in a motor vehicle equipped with an Anti-Locking Braking System. A maximum possible rate of change of velocity (ACCEL limit) for the vehicle is determined over a predetermined range of corresponding vehicle speeds. Wheel speed and estimated reference speed at the wheel (VREF) are determined along with the rate of change of the wheel speed (WHEEL ACCEL). The WHEEL ACCEL is compared to the corresponding ACCEL limit to limit the estimated reference speed to the corresponding ACCEL limit. |
|
DETAILED DESCRIPTION It is a principal object of the present invention to provide an improved spin-up detection system.
It is a further object of the present invention to overcome the limitations of the prior art anti-lock braking systems and providing an improved method and system for estimating vehicle speed reference values (VREFs).
In carrying out the above-stated objects and other features and advantages of the present invention, the method is directed for use with a motor vehicle equipped with an anti-lock braking system (ABS) and includes the initial determination of a maximum possible rate of change of velocity for the vehicle over a predetermined range of corresponding vehicle speeds (ACCEL limit).
The method further includes the determination of wheel speed, which, in the preferred embodiment, is the filtered velocity of wheel speed (FVEL).
Still further, the method includes the determination of an estimated reference speed for the vehicle at the wheel (VREF).
By comparing the determined wheel speed to the determined reference speed (VREF), it may further be determined if the determined wheel speed is less than the VREF.
If so, this would indicate that the wheel is in slip and the VREF is decayed at a predetermined rate based upon the maximum possible rate at which the vehicle could decelerate at the given speed.
The method further includes the determination of the rate of change of the wheel speed (wheel acceleration).
By comparing the determined rate of change of the wheel speed to the corresponding ACCEL limit at the determined reference speed (VREF), the relationships between wheel speed and VREF and wheel acceleration and the ACCEL limit may further be determined.
More particularly, if the wheel speed is greater than the VREF and wheel acceleration is less than the ACCEL limit, the VREF value will be set equal to the determined wheel speed.
This is the condition where the vehicle is accelerating normally thus VREF is set equal to wheel speed.
In contrast, if the wheel speed is greater than the VREF and the wheel acceleration is also greater than the ACCEL limit, the VREF will be limited to the corresponding ACCEL limit
|
|
Navigation and GPS 
