Control system for an automatic transmission
AssigneeAisin Seiki Kabushiki Kaisha
InventorsToshiaki Ishiguro, Masanori Mori
Life of this patent
Estimating the term…
Abstract
A control system for an automatic transmission includes a torque converter which hydraulically transmits rotation of the driving power source to the speed change gear unit, a first friction engagement element, a second friction engagement element, a third friction engagement element, a vehicle stopping detecting mechanism for detecting a vehicle stopped condition when a forward driving range is selected, a vehicle weight detector, and a controller. The controller controls the disengagement of the first and second friction engagement elements and the engagement of the third friction engagement element with an engaging force in response to the vehicle weight when the vehicle stopped condition is detected while the forward driving range is selected.
Claims16
A control system for an automatic transmission having an input shaft and an output shaft comprising:
- a torque converter disposed between a driving power source and a speed change gear unit to hydraulically transmit rotation of the driving power source to the speed change gear unit;
- a first friction engagement element engageable to connect the torque converter and the speed change gear unit;
- a second friction engagement element engageable to perform a forward driving shift stage in the speed change gear unit;
- a third friction engagement element engageable to generate an engaging force to prevent the output shaft from being rotated in a reverse direction;
- vehicle stopping detecting means for detecting a vehicle stopped condition when a forward driving range is selected;
- vehicle weight detecting means for detecting a weight of the vehicle;
- and
- control means for controlling a disengaging operation of the first and second friction engagement elements and an engaging operation of the third friction engagement element with the engaging force in response to the vehicle weight detected by the vehicle weight detecting means when the vehicle stopped condition is detected by the vehicle stopping detecting means while the forward driving range is selected.
A method of controlling an automatic transmission in a vehicle that includes a torque converter which hydraulically transmits rotation of a driving power source having an output shaft to a speed change gear unit, a first friction engagement element engageable to connect the torque converter and the speed change gear unit, a second friction engagement element engageable to perform a forward driving shift stage in the speed change gear unit, and a third friction engagement element engageable to generate an engaging force to prevent the output shaft from being rotated in a reverse direction, the method comprising:
- determining a weight of the vehicle;
- determining a stopped condition of the vehicle when a forward driving range is selected;
- and
- controlling a disengaging operation of the first and second friction engagement elements and an engaging operation of the third friction engagement element by the engaging force based on the determined weight of the vehicle when the vehicle is determined to be stopped while the forward driving range is selected.
Dependencies are inferred from the claim text.