Full throttle directional shift
US6019202A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 1999 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Feb 25, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19153
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electrohydraulic control device for a drive train of a machine having an engine, a transmission, and a torque converter utilizes sliding mode control and a target speed trajectory to constrain the jerk on the machine during a directional shift. Electrohydraulic valves produce fluid flow to hydraulic service brakes and an impeller clutch in the torque converter to controllably engage and disengage the transmission impeller clutch. A sensor generates a signal representative of the output speed of the transmission. An electronic controller receives the sensed speed signal, determines a desired speed signal according to the target speed trajectory, produces an error speed signal in response to a difference between the sensed and desired speeds, and controllably actuates the electrohydraulic valve to reduced any speed error, thereby changing the direction of motion of the machine under controlled jerk levels felt by the operator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.