Hydraulic system for a vehicle transmission
AssigneePunch Powertrain Psa E-Transmissions N.V.
InventorsRoell Marie Van Druten, Peter Mark Smid
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Abstract
The invention relates to a hydraulic system for a vehicle transmission, comprising: a hydraulic circuit arranged for generating a pressure, a hydraulic actuator arranged for engaging a park lock system, wherein the hydraulic actuator is hydraulically connected to the hydraulic circuit for actuation of the hydraulic actuator using the pressure, and a back-up system configured to keep the pressure above a predetermined pressure threshold for maintaining an actuation of the hydraulic actuator for a predetermined period of time in case of an operational interruption of a transmission control unit of the vehicle.
Claims23
A hydraulic system for a vehicle transmission, comprising:
- a hydraulic circuit arranged for generating a pressure,
- a hydraulic actuator arranged for engaging a park lock system, wherein the hydraulic actuator is hydraulically connected to the hydraulic circuit for actuation of the hydraulic actuator using the pressure, and
- a back-up system configured to keep the pressure above a predetermined pressure threshold for maintaining an actuation of the hydraulic actuator for a predetermined period of time in case of an operational interruption of a transmission control unit of the vehicle.
A method for operating a park lock system of a vehicle transmission, including:
- generating a pressure using a hydraulic circuit,
- providing a hydraulic actuator arranged for engaging the park lock system, the hydraulic actuator being hydraulically connected to the hydraulic circuit for actuation of the hydraulic actuator using the pressure,
- wherein a back-up system is employed for keeping the pressure above a predetermined pressure threshold for maintaining an actuation of the hydraulic actuator for a predetermined period of time in case of an operational interruption of a transmission control unit of the vehicle.
Dependencies are inferred from the claim text.