Modulation control system and method for a hybrid transmission

摘要

A hydraulic system includes a main modulation control scheme which relies in part on the use of a VBS solenoid and the multiplexing of that solenoid. The hydraulic system is associated with a hybrid module and by controlling the main pressure at a reduced level, the fuel economy and reliability of that hybrid module are improved. The system pressure is controlled by the multiplexed VBS solenoid in order to maintain adequate clutch pressure based on torque requirements. The overall system cost is reduced by the multiplexing of valves and solenoids.

主权项

1. A hydraulic system for a hybrid electrical vehicle comprising:
a sump containing hydraulic fluid; a main regulator valve constructed and arranged in flow communication with said sump; a main regulator by-pass valve constructed and arranged in flow communication with said sump;
first and second control solenoids wherein said first control solenoid is a variable bleed solenoid; and a control module for managing fluid flow of said hydraulic system, wherein said control module is constructed and arranged for multiplexing of said variable bleed solenoid, wherein said multiplexing is applied for said variable bleed solenoid to either hold the main regulator by-pass valve at an applied position or make the variable bleed solenoid available for main boost.