| 摘要 |
<p>A vehicle automatic clutch control system comprises a brake fluid circuit 5 having a transducer cylinder 1, connected to a receiver cylinder 2 by a pipe 3, and a supply container 4. A snifting bore 25 is connected via pipe 24 to the container 4 (also see figs 2 and 3) so that as the brake fluid in pipe 3 expands, due to temperature rises, the excess volume is compensated by diverting it through bore 25 and pipe 24 to container 4. Without this volume compensation, accurate engagement point detection would not be possible since expansion of the brake fluid column would falsify the relationship between the actual and measured clutch positions. Volume compensation is carried out by closing the clutch cyclically for a duration of, for example, one second and is interrupted when, for example, neutral is selected or a gear is engaged. Other embodiments include a control unit which engages the clutch, according to various algorithms etc, to cause the vehicle to crawl and software/hardware emergency circuits. In all other aspects the clutch operates, by way of hydraulic circuit, in a typical manner with regard to gear changing, starting and stopping etc.</p> |
