| 摘要 |
A controller (140C, fig 1) for a motor vehicle hydraulic disc braking system detects the release of an accelerator input device (e.g. pedal 110P, fig 1), and in response outputs a signal for the amount of brake prefill to be generated, and implementing closed loop feedback so that the prefill magnitude is adjusted to maintain a substantially consistent detected dead travel of a brake input device (e.g. pedal 140P, fig 1). A target prefill pressure is reduced iteratively if the vehicle speed excessively decreases during prefill; or by assessing the pedal position S1 that a gradient of brake pressure S2 increase or a predetermined pressure S2 is achieved. Target dead travel & prefill pressure can vary with speed, lateral acceleration & temperature, and be stored in a lookup table. Thus variations due to aging P1-P3, wear and construction differences are reduced. |
