Electro-hydraulic control system using shift valves for a hybrid drive unit

摘要

A valve body assembly for a hybrid drive unit includes a pressure regulator valve, a first on/off shift valve for controlling a stationary clutch, a second on/off shift valve for controlling a rotating clutch, and a third on/off shift valve for controlling a damper bypass clutch. The control system controls the stationary clutch and the rotating clutch to operate the hybrid drive unit in four different modes. The first shift valve, the second shift valve and the third shift valve do not include a regulated pressure feedback port, nor a pressure switch for indicating a clutch fill level.

主权项

1. A control system for controlling a hybrid drive unit of a vehicle, the control system comprising:
a pressure regulator valve in fluid communication with a plurality of fluid lines and configured for regulating a line pressure of a fluid within the plurality of fluid lines; a first valve in fluid communication with at least one of the plurality of fluid lines and configured for opening and closing fluid communication between the plurality of fluid lines and a first clutch; and a second valve in fluid communication with at least one of the plurality of fluid lines and configured for opening and closing fluid communication between the plurality of fluid lines and a second clutch; wherein the first valve closes fluid communication between the plurality of fluid lines and the first clutch to disengage the first clutch and the second valve closes fluid communication between the plurality of fluid lines and the second clutch to disengage the second clutch to operate the hybrid drive unit in a first mode, the first valve opens fluid communication between the plurality of fluid lines and the first clutch to engage the first clutch and the second valve closes fluid communication between the plurality of fluid lines and the second clutch to disengage the second clutch to operate the hybrid drive unit in a second mode, the first valve opens fluid communication between the plurality of fluid lines and the first clutch to engage the first clutch and the second valve opens fluid communication between the plurality of fluid lines and the second clutch to engage the second clutch to operate the hybrid drive unit in a third mode, and the first valve closes fluid communication between the plurality of fluid lines and the first clutch to disengage the first clutch and the second valve opens fluid communication between the plurality of fluid lines and the second clutch to engage the second clutch to operate the hybrid drive unit in a fourth mode; and wherein the first valve and the second valve each include a shift valve characterized by a lack of a regulated pressure feedback port.