Patent ID: 6701243
Filing Date: 2004-03-02
Classification: B60K,B60T,B60W

Abstract:
Method for controlling traction slip, comprising the steps of:determining a first variable defining a wheel behavior on at least one of a driven wheel, defining control states including increase brake pressure, decrease brake pressure, and maintain brake pressure, controlling said control states in dependence on the determined variable, regulating a change-over between the control states including increasing brake pressure, decreasing brake pressure, maintaining brake pressure, or switching on or off traction slip control, determining a second variable, wherein said second variable is representative of the stability of a running engine speed and a dynamic instability threshold, wherein the dynamic instability threshold is formed from a vehicle-related base value and a share value formed proportionally to the gradient of the engine speed, wherein said engine stability variable is used in controlling said control states wherein the running stability of the engine is calculated from the difference between an engine speedF-E-S and a dynamic instability threshold of the engine, preferably according to the following relation: ENGINE_STABILITY_RESERVE=K1â€¢(FILTERED_ENGINE_SPEEDâˆ’ENGINE_STALLING_THR), wherein ENGINE_STABILITY_RESERVE=running stability of the engine, K1=a constant dependent on the engine characteristic and on the average vehicle weight, FILTERED_ENGINE_SPEED=the filtered engine speed, and ENGINE_STALLING_THR is the instability threshold.