| 摘要 |
<p>A driver-operated gear lever (320) transmits the driver request to a computer module (400) via sensors (340). The module (400) performs the requested gear change by analysing the validity of the driver request, then controlling the clutch, selection and engagement control solenoid valves (216) and interacting with an engine control computer (500) to provide suitable engine speed and torque control during the gear change. The module (400) has means (450) for sensing a low grip condition of the vehicle wheels so that, when such a condition is sensed, the module (400) can operate to minimise changes in the engine torque transmitted to the wheels. Said means (450) are also preferably capable of automatically selecting second gear when the vehicle is at a standstill and low grip conditions have been sensed. The commands are confirmed by position sensors (206) on the actuators (200, 202 and 204) and the engine speed sensors (102, 120), at the input and output of the gearbox. The absolute gear ratio engaged in the gearbox (100) is shown on a display (410).</p> |
