Control of IC engine with auto gearbox - has drive torque before and after proposed gear shift, plus shifting point and fuel consumption predicted

摘要

A car has an auto gearbox and indicators for parameters like engine load, throttle flap angle, car speed and gear ratio. There is a storage unit for the engine characteristic, the torque converter characteristic and the fuel consumption characteristic. The drive torque before and after a proposed gear shift, a value for the fuel consumption rate and the shifting point are all calculated in real time using signals from the indicators and the storage unit. If the calculations satisfy certain conditions, a shifting signal is sent to the gearbox. If one of the indicator signals is greater than a threshold near the maximum value, the shifting signal is sent when the engine speed drops by a certain amount.