Electronic control devices applicable to anti-skid equipment in automobile vehicles

• US 4,033,635 A
• Filed: 04/01/1976
• Issued: 07/05/1977
• Est. Priority Date: 03/13/1974
• Status: Expired due to Term

• Current Assignee: Robert Bosch SA (Robert Bosch GmbH)
• Original Assignee: Fabrica Espanola Magnetos SA
• Inventors: Montoya, Jose Maria Tarrafeta
• Primary Examiner(s): Kunin, Stephen G.
• Application Number:
  US05/672,774
• Time in Patent Office: 460 Days
• Field of Search: 73/503, 73/510, 73/517 R, 188/181 C, 303/20, 303/106, 303/109, 303/111, 307/10 R, 317/5, 324/161, 340/53, 340/62, 340/263
• US Class Current: 303/182
• CPC Class Codes: B60T 8/173 Eliminating or reducing the effect of unwanted signals, e.g. due to vibrations or electrical noise
• CPC Class Codes: B60T 8/17613 based on analogue circuits or digital circuits comprised of discrete electronic elements

Abstract

The present invention refers to an electronic control device applicable to anti-skid equipment in automobile vehicles which compares the speed of the wheel with a voltage corresponding to the level of optimum vehicle-wheel slip. On the basis of the result of this comparison, the device operates an actuating system that increases or decreases the pressure on the brakes with the aim of maintaining the slip of the wheel around the skid for which maximum adherence is presented.

Claims

1. An electronic control device applicable to anti-skid equipment in automobile vehicles, said device comprising;

elements for maintaining each wheel of a vehicle at an optimum value of slip for which road surface to wheel adherence is at a maximum level, a velocity corresponding to said slip value being obtained from a first unit generating a signal corresponding to an acceleration of the vehicle and a second unit generating a signal corresponding to the velocity of the wheel at an instant in which the acceleration of the wheel is at a maximum value with its brake released;

means for generating a signal corresponding to a deceleration of the vehicle comprising a longitudinal accelerometer and a corrector circuit for eliminating any errors due to road slope;

means for generating a signal corresponding to the velocity of the wheel;

means for generating a comparison signal representative of the velocity corresponding to the optimum value of slip from the deceleration of the vehicle, said comparison signal being corrected to a value of the optimum slip level in each reacceleration of the wheel by means of a differentiator and a detector of maximums;

means for comparing the velocity of each wheel with a comparison signal, and according to a result thereof, applying and releasing the brake pressure of said wheel as required; and

means for changing the comparison signal depending upon the response of the brake actuator of the vehicle.