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US 9,133,929 B2Granted
Main modulation calibration using control main valve
AssigneeAllison Transmission, Inc.
InventorCharles F. Long
Life of this patent
Estimating the term…
Abstract
Various embodiments of methods, apparatus and systems that calibrate main modulation of an electro-hydraulic control system for a vehicle transmission are presented. Some embodiments calibrate regulator control signals that cause a main regulator valve to develop a main line pressure based upon status of a control main valve that develops a control main pressure based upon the main line pressure.
Claims9
An electro-hydraulic control system for a transmission, comprising
- a main regulator valve to modulate a main line pressure of fluid of the electro-hydraulic control system based upon regulator control signals,
- a control main valve to receive fluid at the main line pressure, to develop a control main pressure based upon the main line pressure, and to generate a status signal that indicates whether the control main valve is in a regulating state due to the main line pressure,
- a clutch trim valve to exert a clutch feed pressure upon a clutch of the transmission based upon fluid received at the control main pressure, fluid received at the main line pressure, and a clutch control signal, and
- an electronic control module to generate regulator control signals, to detect via the status signal whether the control main valve is in the regulating state, and to calibrate the regulator control signals based upon the regulator control signals associated with the control main valve entering or leaving the regulating state.
1 more element
A vehicle transmission comprising
- a plurality of gearsets and clutches that selectively define a speed ratio,
- an electro-hydraulic control system to control the transmission, and
- a fluid supply system to supply fluid to the electro-hydraulic control system, wherein the electro-hydraulic control system comprises
- a main regulator valve to modulate a main line pressure based upon regulator control signals,
- a control main valve to develop a control main pressure based on the main line pressure,
- a plurality of clutch trim valves to selectively engage the clutches of the transmission based upon clutch control signals, the main line pressure, and the control main pressure, and
- an electronic control module to generate regulator control signals that adjust the main line pressure, to detect via a status signal of the control main valve that the main line pressure has a predetermined relationship to a threshold pressure level associated with a regulating state of the control main valve, and to calibrate the regulator control signals in response to the status signal indicating that the main line pressure has the predetermined relationship to the threshold pressure level.
4 more elements
Dependencies are inferred from the claim text.