Brake force control device for back-control
First Claim
1. A brake force control device for vehicles with a back-control means reducing the brake pressure of the pressure control medium upon exceeding a maximum force acting at a wheel and with disengagement of the back-control means with a re-decreasing force after re-passing through the maximum value, characterized by further means for controlling the engagement and disengagement of said back-control means by signals including signal producing means for forming said signals, taking into consideration the hysteresis effect of the control operation, by the signs of the derivatives with respect to time of the force acting on the wheel and of the brake pressure, and characterized in that the back-control means causing a reduction of the brake pressure is initiated with an increasing brake pressure and a decreasing wheel force only if prior thereto both wheel force and brake pressure increased, and is turned-off with a decreasing brake pressure and a decreasing wheel force only if prior thereto the wheel force increased with a decreasing brake pressure.
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Accused Products
Abstract
A brake force control system for vehicles, especially an electronic brake force control system for motor vehicles and rail vehicles, with a back-control (1) reduction control (1) of the brake pressure of the pressure control medium causing a reduction of the brake pressure when a maximum wheel circumferential force acting at the wheel is exceeded; the back-control being disengaged when the wheel circumferential force again increases after re-exceeding the maximum value whereby the engagement and disengagement of the back-control of the brake pressure is controlled by signals which are formed, taking into consideration the hysteresis effect of the control operation, by the signs of the derivatives with respect to time of the circumferential force and of the brake pressure.
31 Citations
21 Claims
- 1. A brake force control device for vehicles with a back-control means reducing the brake pressure of the pressure control medium upon exceeding a maximum force acting at a wheel and with disengagement of the back-control means with a re-decreasing force after re-passing through the maximum value, characterized by further means for controlling the engagement and disengagement of said back-control means by signals including signal producing means for forming said signals, taking into consideration the hysteresis effect of the control operation, by the signs of the derivatives with respect to time of the force acting on the wheel and of the brake pressure, and characterized in that the back-control means causing a reduction of the brake pressure is initiated with an increasing brake pressure and a decreasing wheel force only if prior thereto both wheel force and brake pressure increased, and is turned-off with a decreasing brake pressure and a decreasing wheel force only if prior thereto the wheel force increased with a decreasing brake pressure.
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8. A brake force control device for vehicles with a back-control means reducing the brake pressure of the pressure control medium upon exceeding a maximum circumferential wheel force acting at a wheel and with disengagement of the back-control means with a re-decreasing force after re-passing through the maximum circumferential wheel force, the brake force control device including means having time constants resulting in a hysteresis effect of the control operation, characterized by further means for controlling the engagement and disengagement of said back-control means by signals including signal producing means for forming said signals in consideration of the hysteresis effect of the control operation by the signs of the derivatives with respect to time of the circumferential wheel force acting on the wheel and of the brake pressure, and characterized in that the back-control means causing a reduction of the brake pressure is initiated with an increasing brake pressure and a decreasing circumferential wheel force only if prior thereto both circumferential wheel force and brake pressure increased, and is turned-off with a decreasing brake pressure and a decreasing circumferential wheel force only if prior thereto the circumferential wheel force increased with a decreasing brake pressure.
- 9. A brake force control device for vehicles with a back-control means reducing the brake pressure of the pressure control medium upon exceeding a maximum wheel force acting at a wheel and with disengagement of the back-control means with a re-decreasing force after re-passing through the maximum wheel force, the brake force control device including means having time constants resulting in a hysteresis effect of the control operation, characeterized by further means for controlling the engagement and disengagement of said back-control means by signals including signal producing means for forming said signals, said signal producing means including means for compensating for the hysteresis effect of the control operation in accordance with the signs of the derivatives with respect to time of the wheel force acting on the wheel and of the brake pressure so as to avoid improper control in response to the hysteresis effect.
Specification