Idling control system for an automatic transmission providing smooth starting off action
An idling control system is described for an automatic transmission system for a vehicle equipped with an engine and a braking system. The automatic transmission system comprises a gear transmission mechanism which comprises: a power output shaft, a forward clutch which is engaged when the gear transmission mechanism is engaged to a forward speed stage, a one way clutch which in cooperation with the forward clutch provides a first speed stage by means of rotation prevention, and a brake. When the brake is engaged, in cooperation with the one way clutch it prevents the power output shaft of the gear transmission mechanism from rotating in the direction to allow reverse motion of the vehicle. The system comprises: a first means for engaging the forward clutch selectively either to a maximum amount or to an intermediate amount substantially lower than the maximum amount; a second means for selectively engaging the brake; and a third means for: when it comes to be that the automatic transmission is being operated in a forward driving mode, the vehicle is substantially stationary, the engine is in substantially idling condition, and the braking system is applied; starting the actuation of the first means to engage the forward clutch to the intermediate amount and starting the actuation of the second means to engage the brake.
- Assignee:
- Toyota Jidosha Kabushiki Kaisha, Toyota
- Patent Number(s):
- US 4644826
- OSTI ID:
- 7082455
- Resource Relation:
- Patent File Date: Filed date 26 Aug 1985
- Country of Publication:
- United States
- Language:
- English
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