| 摘要 |
<p>A vehicle transmission which includes a multi-ratio gearbox (12), an electronic control means (36) which receives inputs from a plurality of operating parameters of an associated vehicle and determines the appropriate gearbox ratio for the current vehicle operating conditions, and a ratio selection means (25) which receives ratio selection signals from the electronic control means (36) and selects the appropriate ratio. The electronic control means (36) is also arranged to signal a downshift in the operative ratio of the gearbox (12) if any one of the following conditions occurs: a) a predetermined rate of depression of an associated vehicle accelerator (19) is exceeded; b) brakes of an associated vehicle are applied; c) a zero depression condition of the accelerator (19) has existed for a predetermined time period; d) an increase in the speed (Vv) of the associated vehicle is detected when a zero depression of the accelerator (19) exists; and e) an increase in accelerator depression (Va) is detected combined with a decrease in vehicle speed (Vv).</p> |
