| 摘要 |
The invention relates to a method for determining initial pressure originating from between a main brake cylinder (2) and an inlet valve (9) of a wheel brake cylinder (8) of a motor vehicle braking system, said pressure determining initial pressure by taking into account the course of return tension of a motor (15) of a pump (14), which is operated in a clocked manner, said pump being used to return the brake fluid from the low pressure accumulator (13) in the main brake cylinder (2). Several characteristic variables (UonL; UonF; Uoff; UFall; UMin; Usum; Uslope; URise;tfall) of the tension course are measured and are brought together in order to determine an initial pressure value and the quality and/or reliability of the measured characteristic variables (UonL; UonF; UOff; UFall; UMin; USum; USlope; URise; tFall) are evaluated, the characteristic variables (UonL; UonF;UOff; UFall; UMin; USum; Uslope; URise; tFall) and/or the initial pressure values determined therefrom are filtered and/or prepared if the quality and/or reliability of the measured characteristic variables are low, the initial values which are determined from the various characteristic variables (UonL; UonF; UOff; UFall; UMin; USum; Uslope; URise; tFall) are averaged and only the pressure values of similar variables are taken into account, and a temporal averaging of the initial pressure values which is used to dampen fluctuations is carried out. |
