SPEED CHANGE CONTROL DEVICE FOR AUTOMATIC TRANSMISSION

摘要

PURPOSE:To surely prevent the occurrence of blow-up and tie-ups in an engine at all times when a clutch-to-clutch transmission section is actuated. CONSTITUTION:The device is equipped with a blow-up detection means 3 detecting the blow-up condition of an engine E while a clutch-to-clutch transmission section is being actuated, and with a hydraulic pressure control means 4 controlling at least either one of the drain hydraulic pressure of a friction engagement means at the releasing side and the engaging hydraulic pressure of a friction engagement means at the engagement side in such a way that the amount of blow-up of the engine E is in a range of an amount set in advance based on the blow-up condition detected by the blow-up detection means 3. Since the change in revolution of the engine E at the time of speed change is reflected to hydraulic pressure control, for friction engagement related with speed change by the clutch-to-clutch transmission section. It is possible to surely prevent the occurrence of excess blow-up of the engine E and a lowering of the output shaft torque due to the tie-up of the friction engagement means at all times.