Electronic control process for an automatic transmission
AssigneeZF Friedrichshafen AG
InventorPeter Wendel
Life of this patent
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Abstract
A process is disclosed for electronically controlling an automatic transmission in which the torque transmission is reduced when the engine throttle setting and vehicle speed are below a threshold. The transmitted torque causes the vehicle to creep slightly, warning the driver that a gear is engaged. The slant and load of the vehicle are taken into account for controlling the drive torque.
Claims4
An electronic control process for a vehicle with an automatic transmission (10) having a clutch, lying in the power path, controlled by a microprocessor (7), a gear selector (1), a sensor (2) which detects a velocity of the vehicle, a sensor (3) which detects an engine throttle valve setting, and a sensor (4) which detects an inclination of the vehicle, and said microprocessor (7), with a vehicle velocity of zero or near zero and an engine throttle setting of zero or near zero, regulating the clutch lying in the power path such that the transmitted torque compensates for influences resulting from the vehicle inclination, with a weight of the vehicle and a load being taken into account for the control of the clutch, said process comprising the steps of:
- determining the inclination of the vehicle with respect to the road;
- and
- using the inclination of the vehicle with respect to the road to regulate the clutch lying in the power path.
An electronic control process according to claim l, further comprising the step of using a range of an output of headlights of the vehicle relative to the road to detect the inclination of the vehicle with respect to the road.
Dependencies are inferred from the claim text.