Hydraulic control system for automatic transmission
A hydraulic control system is described for an automatic transmission including hydraulic servos for clutches and brakes to engage and disengage components in the transmission gear mechanism and having a forward clutch hydraulic servo and a brake hydraulic servo, and a manual valve, comprising:a modulator valve for adjusting line pressure to a predetermined modulator pressure; a control valve adapted to be shifted in response to signals based on positions of the manual valve and the vehicle running condition; a first oil path connected between the control valve and the manual valve as a line pressure oil path; the control valve including a first port connecting to the forward clutch hydraulic servo; a second oil path connected between the control valve and the brake hydraulic servo; and a shift valve situated in the second oil path, the shift valve not operating during a low speed vehicle condition, the shift valve being adapted to connect the second oil path when the shift valve shifts to a low speed position and to disconnect the oil path when the shift valve shifts to a high speed position.
- Assignee:
- Aisin-Warner Kabushiki Kaisha, Anjo
- Patent Number(s):
- US 4829853
- OSTI ID:
- 5617431
- Resource Relation:
- Patent File Date: Filed date 1 Dec 1987
- Country of Publication:
- United States
- Language:
- English
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