# US 9,039,569 B2 · Method for controlling an automated transmission

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- Number: US 9,039,569 B2
- Document ID: US9039569B2
- Status: Granted
- Kind: B2
- Application number: 14/001,195
- Filed: 2012-03-02
- Published: 2014-01-23
- Granted: 2015-05-26
- Earliest claimed: 2011-04-11
- Assignees: ZF Friedrichshafen AG
- Applicants: Mario Steinborn; Jochen Breuer; Christoph Ruechardt; Thomas Jaeger; Roland Mair; Melchor Moro-Oliveros
- Inventors: Mario Steinborn; Jochen Breuer; Christoph Ruechardt; Thomas Jaeger; Roland Mair; Melchor Moro-Oliveros
- Web page: https://patentgrep.com/patent/US9039569B2

## CPC

- F15B 15/00: Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F16H 61/2807: {using electric control signals for shift actuators, e.g. electro-hydraulic control therefor (F16H61/30, F16H61/32 take precedence)}
- F16H 2061/047: {by preventing or solving a tooth butt situation upon engagement failure due to misalignment of teeth}
- F16H 2061/2823: {Controlling actuator force way characteristic, i.e. controlling force or movement depending on the actuator position, e.g. for adapting force to synchronisation and engagement of gear clutch}
- F16H 2306/48: Synchronising of new gear
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F16H: GEARING

## Abstract

A method of controlling an automated transmission for motor vehicles with one or several pressure activated positioning cylinders (6, 8, 20), via the assigned shift valves (10, 12), at least one main cut-off valve (4) which is positioned prior to the shift valves, and a control device for controlling the shift and main cut-off valves. The pressure requests, for the shifting, are determined and the respective main cut-off valves are triggered depending on the determined pressure requests. To enable a variable match of the supply pressure during transmission shifts, respective optimized pressures or pressure patterns are determined for certain shift scenarios which, for instance, consider a mass to be synchronized, the existence of a tooth-on-tooth position, or the like. Through this method, for instance, the load on shift elements, the shift timing, and the shift noise can be positively influenced.

## Claims

### Claim 1

A method of controlling an automated transmission for a motor vehicle comprising at least one pressure activated positioning cylinder (6, 8, 20), having assigned shift valves (10, 12), at least one main cut-off valve (4) which is positioned before to the shift valves, and a control device for controlling the shift valves and the at least one main cut-off valve, the method comprising the steps of:
determining a pressure request for shifting;
triggering the at least one main cut-off valve depending on the determining pressure request;
determining, for different shift scenarios of a shift transmission, a nominal pressure or a nominal pressure pattern, respectively, of the shift valves (10, 12) by consideration of at least two of the following criteria:
a mass to be synchronized with regard to a synchronous rotation speed which needs to be adjusted;
a desired variable nominal pressure over a synchronization pattern;
a condition of a tooth-on-tooth position of two gear wheels;
a shifting of a gear step into neutral;
a piston position in a respective positioning cylinder;
a desired piston speed in the positioning cylinder;
a desired piston acceleration in the positioning cylinder;
a respective gear step which needs to be shifted; and
a requirement of substitution functions during problems with nominal functions;
operating the at least one main cut-off valve (4) in accordance with the nominal pressure or the nominal pressure pattern; and
weighting the criteria against one another and using the weighted criteria as a basis for predetermined priorities of the shift operation.

### Claim 2

A method of controlling an automated transmission for a motor vehicle comprising a least one pressure activated positioning cylinder (6, 8, 20), having assigned shift valves (10, 12), at least one main cut-off valve (4) which is positioned before to the shift valves, and a control device for controlling the shift valves and the at least one main cut-off valve, the method comprising the steps of:
determining a pressure request for shifting;
triggering the at least one main cut-off valve depending on the determining pressure request;
determining, for different shift scenarios of a shift transmission, a nominal pressure or a nominal pressure pattern, respectively, of the shift valves (10, 12) by consideration of at least one of the following criteria:
a mass to be synchronized with regard to a synchronous rotation speed which needs to be adjusted;
a desired variable nominal pressure over a synchronization pattern;
a condition of a tooth-on-tooth position of two gear wheels;
a shifting of a gear step into neutral;
a piston position in a respective positioning cylinder;
a desired piston speed in the positioning cylinder;
a desired piston acceleration in the positioning cylinder;
a respective gear step which needs to be shifted; and
a requirement of substitution functions during problems with nominal functions;
operating the at least one main cut-off valve (4) in accordance with the nominal pressure or the nominal pressure pattern; and
overlaying the criteria with at least one of the respective nominal pressure or the nominal pressure pattern, respectively, so as to result in a total nominal pressure.